번역된 테마로 콘텐츠를 조회해도 한글 테마처럼 처리하기

- 온라인 경로에서 콘텐츠 테마 번역을 배치 조회/번역/저장으로 처리.
- 기존 번역은 IN 조회, 미번역만 한 번의 번역 요청 후 저장.
- 결과 순서 보전, 번역 누락/실패 시 원문으로 폴백.
- 공개 API 변경 없음.

src/main/kotlin/kr/co/vividnext/sodalive/admin/chat/character/AdminChatCharacterController.kt

@@ -13,8 +13,13 @@ import kr.co.vividnext.sodalive.chat.character.CharacterType
 import kr.co.vividnext.sodalive.chat.character.service.ChatCharacterService
 import kr.co.vividnext.sodalive.common.ApiResponse
 import kr.co.vividnext.sodalive.common.SodaException
+import kr.co.vividnext.sodalive.content.LanguageDetectEvent
+import kr.co.vividnext.sodalive.content.LanguageDetectTargetType
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationEvent
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationTargetType
 import kr.co.vividnext.sodalive.utils.generateFileName
 import org.springframework.beans.factory.annotation.Value
+import org.springframework.context.ApplicationEventPublisher
 import org.springframework.http.HttpEntity
 import org.springframework.http.HttpHeaders
 import org.springframework.http.HttpMethod
@@ -40,6 +45,7 @@ class AdminChatCharacterController(
     private val adminService: AdminChatCharacterService,
     private val s3Uploader: S3Uploader,
     private val originalWorkService: AdminOriginalWorkService,
+    private val applicationEventPublisher: ApplicationEventPublisher,
 
     @Value("\${weraser.api-key}")
     private val apiKey: String,
@@ -165,6 +171,18 @@ class AdminChatCharacterController(
             originalWorkService.assignOneCharacter(request.originalWorkId, chatCharacter.id!!)
         }
 
+        // 5. 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
+        //    언어 감지에 사용할 내용은 chatCharacter.description 만 사용한다.
+        if (chatCharacter.languageCode.isNullOrBlank() && chatCharacter.description.isNotBlank()) {
+            applicationEventPublisher.publishEvent(
+                LanguageDetectEvent(
+                    id = chatCharacter.id!!,
+                    query = chatCharacter.description,
+                    targetType = LanguageDetectTargetType.CHARACTER
+                )
+            )
+        }
+
         ApiResponse.ok(null)
     }
 
@@ -315,6 +333,13 @@ class AdminChatCharacterController(
             request = request
         )
 
+        applicationEventPublisher.publishEvent(
+            LanguageTranslationEvent(
+                id = request.id,
+                targetType = LanguageTranslationTargetType.CHARACTER
+            )
+        )
+
         // 원작 연결: originalWorkId가 있으면 서비스 계층을 통해 배정
         if (request.originalWorkId != null) {
             // 서비스에서 유효성 검증 및 저장까지 처리

src/main/kotlin/kr/co/vividnext/sodalive/admin/content/theme/AdminContentThemeService.kt

@@ -5,8 +5,11 @@ import kr.co.vividnext.sodalive.aws.s3.S3Uploader
 import kr.co.vividnext.sodalive.common.SodaException
 import kr.co.vividnext.sodalive.content.theme.AudioContentTheme
 import kr.co.vividnext.sodalive.content.theme.GetAudioContentThemeResponse
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationEvent
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationTargetType
 import kr.co.vividnext.sodalive.utils.generateFileName
 import org.springframework.beans.factory.annotation.Value
+import org.springframework.context.ApplicationEventPublisher
 import org.springframework.data.repository.findByIdOrNull
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
@@ -18,6 +21,8 @@ class AdminContentThemeService(
     private val objectMapper: ObjectMapper,
     private val repository: AdminContentThemeRepository,
 
+    private val applicationEventPublisher: ApplicationEventPublisher,
+
     @Value("\${cloud.aws.s3.bucket}")
     private val bucket: String
 ) {
@@ -37,7 +42,14 @@ class AdminContentThemeService(
     }
 
     fun createTheme(theme: String, imagePath: String) {
-        repository.save(AudioContentTheme(theme = theme, image = imagePath))
+        val savedTheme = repository.save(AudioContentTheme(theme = theme, image = imagePath))
+
+        applicationEventPublisher.publishEvent(
+            LanguageTranslationEvent(
+                id = savedTheme.id!!,
+                targetType = LanguageTranslationTargetType.CONTENT_THEME
+            )
+        )
     }
 
     fun themeExistCheck(request: CreateContentThemeRequest) {

src/main/kotlin/kr/co/vividnext/sodalive/api/home/HomeService.kt

@@ -1,7 +1,9 @@
 package kr.co.vividnext.sodalive.api.home
 
 import kr.co.vividnext.sodalive.audition.AuditionService
+import kr.co.vividnext.sodalive.chat.character.dto.Character
 import kr.co.vividnext.sodalive.chat.character.service.ChatCharacterService
+import kr.co.vividnext.sodalive.chat.character.translate.AiCharacterTranslationRepository
 import kr.co.vividnext.sodalive.content.AudioContentMainItem
 import kr.co.vividnext.sodalive.content.AudioContentService
 import kr.co.vividnext.sodalive.content.ContentType
@@ -11,9 +13,11 @@ import kr.co.vividnext.sodalive.content.main.curation.AudioContentCurationServic
 import kr.co.vividnext.sodalive.content.series.ContentSeriesService
 import kr.co.vividnext.sodalive.content.series.GetSeriesListResponse
 import kr.co.vividnext.sodalive.content.theme.AudioContentThemeService
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationRepository
 import kr.co.vividnext.sodalive.creator.admin.content.series.SeriesPublishedDaysOfWeek
 import kr.co.vividnext.sodalive.event.GetEventResponse
 import kr.co.vividnext.sodalive.explorer.ExplorerQueryRepository
+import kr.co.vividnext.sodalive.i18n.LangContext
 import kr.co.vividnext.sodalive.live.room.LiveRoomService
 import kr.co.vividnext.sodalive.live.room.LiveRoomStatus
 import kr.co.vividnext.sodalive.member.Member
@@ -47,6 +51,11 @@ class HomeService(
     private val rankingRepository: RankingRepository,
     private val explorerQueryRepository: ExplorerQueryRepository,
 
+    private val contentTranslationRepository: ContentTranslationRepository,
+    private val aiCharacterTranslationRepository: AiCharacterTranslationRepository,
+
+    private val langContext: LangContext,
+
     @Value("\${cloud.aws.cloud-front.host}")
     private val imageHost: String
 ) {
@@ -111,6 +120,8 @@ class HomeService(
             }
         }
 
+        val translatedLatestContentList = getTranslatedContentList(contentList = latestContentList)
+
         val eventBannerList = GetEventResponse(
             totalCount = 0,
             eventList = emptyList()
@@ -138,7 +149,7 @@ class HomeService(
         )
 
         // 인기 캐릭터 조회
-        val popularCharacters = characterService.getPopularCharacters()
+        val translatedPopularCharacters = getTranslatedAiCharacterList(aiCharacterList = characterService.getPopularCharacters())
 
         val currentDateTime = LocalDateTime.now()
         val startDate = currentDateTime
@@ -159,12 +170,64 @@ class HomeService(
             sort = ContentRankingSortType.REVENUE
         )
 
+        val contentRankingContentIds = contentRanking.map { it.contentId }
+        val translatedContentRanking = if (contentRankingContentIds.isNotEmpty()) {
+            val translations = contentTranslationRepository
+                .findByContentIdInAndLocale(contentIds = contentRankingContentIds, locale = langContext.lang.code)
+                .associateBy { it.contentId }
+
+            contentRanking.map { item ->
+                val translatedTitle = translations[item.contentId]?.renderedPayload?.title
+                if (translatedTitle.isNullOrBlank()) {
+                    item
+                } else {
+                    item.copy(title = translatedTitle)
+                }
+            }
+        } else {
+            contentRanking
+        }
+
         val recommendChannelList = recommendChannelService.getRecommendChannel(
             memberId = memberId,
             isAdult = isAdult,
             contentType = contentType
         )
 
+        /**
+         * recommendChannelList의 콘텐츠 번역 데이터 조회
+         *
+         * languageCode != null
+         * contentTranslationRepository를 이용해 번역 콘텐츠를 조회한다. - contentId, locale
+         *
+         * 한 번에 조회하고 contentId를 매핑하여 recommendChannelList의 콘텐츠 title을 번역 데이터로 변경한다
+         */
+        val channelContentIds = recommendChannelList
+            .flatMap { it.contentList }
+            .map { it.contentId }
+            .distinct()
+
+        val translatedRecommendChannelList = if (channelContentIds.isNotEmpty()) {
+            val translations = contentTranslationRepository
+                .findByContentIdInAndLocale(contentIds = channelContentIds, locale = langContext.lang.code)
+                .associateBy { it.contentId }
+
+            recommendChannelList.map { channel ->
+                val translatedContentList = channel.contentList.map { item ->
+                    val translatedTitle = translations[item.contentId]?.renderedPayload?.title
+                    if (translatedTitle.isNullOrBlank()) {
+                        item
+                    } else {
+                        item.copy(title = translatedTitle)
+                    }
+                }
+
+                channel.copy(contentList = translatedContentList)
+            }
+        } else {
+            recommendChannelList
+        }
+
         val freeContentList = contentService.getLatestContentByTheme(
             theme = contentThemeService.getActiveThemeOfContent(
                 isAdult = isAdult,
@@ -183,6 +246,8 @@ class HomeService(
             }
         }
 
+        val translatedFreeContentList = getTranslatedContentList(contentList = freeContentList)
+
         // 포인트 사용가능 콘텐츠 리스트 - 랜덤으로 가져오기 (DB에서 isPointAvailable 조건 적용)
         val pointAvailableContentList = contentService.getLatestContentByTheme(
             theme = emptyList(),
@@ -199,6 +264,8 @@ class HomeService(
             }
         }
 
+        val translatedPointAvailableContentList = getTranslatedContentList(contentList = pointAvailableContentList)
+
         val curationList = curationService.getContentCurationList(
             tabId = 3L, // 기존에 사용하던 단편 탭의 큐레이션을 사용
             isAdult = isAdult,
@@ -210,17 +277,17 @@ class HomeService(
             liveList = liveList,
             creatorRanking = creatorRanking,
             latestContentThemeList = latestContentThemeList,
-            latestContentList = latestContentList,
+            latestContentList = translatedLatestContentList,
             bannerList = bannerList,
             eventBannerList = eventBannerList,
             originalAudioDramaList = originalAudioDramaList,
             auditionList = auditionList,
             dayOfWeekSeriesList = dayOfWeekSeriesList,
-            popularCharacters = popularCharacters,
-            contentRanking = contentRanking,
-            recommendChannelList = recommendChannelList,
-            freeContentList = freeContentList,
-            pointAvailableContentList = pointAvailableContentList,
+            popularCharacters = translatedPopularCharacters,
+            contentRanking = translatedContentRanking,
+            recommendChannelList = translatedRecommendChannelList,
+            freeContentList = translatedFreeContentList,
+            pointAvailableContentList = translatedPointAvailableContentList,
             recommendContentList = getRecommendContentList(
                 isAdultContentVisible = isAdultContentVisible,
                 contentType = contentType,
@@ -249,7 +316,7 @@ class HomeService(
             listOf(theme)
         }
 
-        return contentService.getLatestContentByTheme(
+        val contentList = contentService.getLatestContentByTheme(
             theme = themeList,
             contentType = contentType,
             isFree = false,
@@ -261,6 +328,8 @@ class HomeService(
                 true
             }
         }
+
+        return getTranslatedContentList(contentList = contentList)
     }
 
     fun getDayOfWeekSeriesList(
@@ -371,6 +440,76 @@ class HomeService(
             }
         }
 
-        return result
+        return getTranslatedContentList(contentList = result)
+    }
+
+    /**
+     * 콘텐츠 리스트의 제목을 현재 언어(locale)에 맞춰 일괄 번역한다.
+     *
+     * 처리 절차:
+     * - 입력된 콘텐츠들의 contentId 집합을 만들고, 요청 언어 코드(langContext.lang.code)로
+     *   contentTranslationRepository에서 번역 데이터를 한 번에 조회한다.
+     * - 각 항목에 대해 번역된 제목이 존재하고 비어있지 않으면 title만 번역 값으로 교체한다.
+     * - 번역이 없거나 공백이면 원본 항목을 그대로 반환한다.
+     *
+     * 성능:
+     * - N건의 항목을 1회의 조회로 해결하기 위해 IN 쿼리를 사용한다.
+     *
+     * @param contentList 번역 대상 AudioContentMainItem 목록
+     * @return 제목이 가능한 항목은 번역된 목록(불변 사본), 그 외는 원본 항목 유지
+     */
+    private fun getTranslatedContentList(contentList: List<AudioContentMainItem>): List<AudioContentMainItem> {
+        val contentIds = contentList.map { it.contentId }
+
+        return if (contentIds.isNotEmpty()) {
+            val translations = contentTranslationRepository
+                .findByContentIdInAndLocale(contentIds = contentIds, locale = langContext.lang.code)
+                .associateBy { it.contentId }
+
+            contentList.map { item ->
+                val translatedTitle = translations[item.contentId]?.renderedPayload?.title
+                if (translatedTitle.isNullOrBlank()) {
+                    item
+                } else {
+                    item.copy(title = translatedTitle)
+                }
+            }
+        } else {
+            contentList
+        }
+    }
+
+    /**
+     * AI 캐릭터 리스트의 이름/설명을 현재 언어(locale)에 맞춰 일괄 번역한다.
+     *
+     * 처리 절차:
+     * - characterId 목록을 추출하고, 요청 언어 코드로 aiCharacterTranslationRepository에서
+     *   번역 데이터를 한 번에 조회한다.
+     * - 각 캐릭터에 대해 name과 description 모두 번역 값이 존재하고 비어있지 않을 때에만
+     *   해당 필드를 교체한다. 둘 중 하나라도 없으면 원본 캐릭터를 그대로 유지한다.
+     *
+     * @param aiCharacterList 번역 대상 캐릭터 목록
+     * @return 가능한 경우 name/description이 번역된 캐릭터 목록, 그 외는 원본 유지
+     */
+    private fun getTranslatedAiCharacterList(aiCharacterList: List<Character>): List<Character> {
+        val characterIds = aiCharacterList.map { it.characterId }
+
+        return if (characterIds.isNotEmpty()) {
+            val translations = aiCharacterTranslationRepository
+                .findByCharacterIdInAndLocale(characterIds = characterIds, locale = langContext.lang.code)
+                .associateBy { it.characterId }
+
+            aiCharacterList.map { character ->
+                val translatedName = translations[character.characterId]?.renderedPayload?.name
+                val translatedDesc = translations[character.characterId]?.renderedPayload?.description
+                if (translatedName.isNullOrBlank() || translatedDesc.isNullOrBlank()) {
+                    character
+                } else {
+                    character.copy(name = translatedName, description = translatedDesc)
+                }
+            }
+        } else {
+            aiCharacterList
+        }
     }
 }

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/ChatCharacter.kt

@@ -22,6 +22,8 @@ class ChatCharacter(
     // 캐릭터 한 줄 소개
     var description: String,
 
+    var languageCode: String? = null,
+
     // AI 시스템 프롬프트
     @Column(columnDefinition = "TEXT", nullable = false)
     var systemPrompt: String,

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterComment.kt

@@ -16,6 +16,7 @@ import javax.persistence.Table
 data class CharacterComment(
     @Column(columnDefinition = "TEXT", nullable = false)
     var comment: String,
+    var languageCode: String?,
     var isActive: Boolean = true
 ) : BaseEntity() {
     @ManyToOne(fetch = FetchType.LAZY)

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentController.kt

@@ -47,7 +47,7 @@ class CharacterCommentController(
         if (member.auth == null) throw SodaException("본인인증을 하셔야 합니다.")
         if (request.comment.isBlank()) throw SodaException("댓글 내용을 입력해주세요.")
 
-        val id = service.addReply(characterId, commentId, member, request.comment)
+        val id = service.addReply(characterId, commentId, member, request.comment, request.languageCode)
         ApiResponse.ok(id)
     }
 

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentDto.kt

@@ -2,7 +2,8 @@ package kr.co.vividnext.sodalive.chat.character.comment
 
 // Request DTOs
 data class CreateCharacterCommentRequest(
-    val comment: String
+    val comment: String,
+    val languageCode: String? = null
 )
 
 // Response DTOs
@@ -20,7 +21,8 @@ data class CharacterCommentResponse(
     val memberNickname: String,
     val createdAt: Long,
     val replyCount: Int,
-    val comment: String
+    val comment: String,
+    val languageCode: String?
 )
 
 // 답글 Response 단건(목록 원소)
@@ -35,7 +37,8 @@ data class CharacterReplyResponse(
     val memberProfileImage: String,
     val memberNickname: String,
     val createdAt: Long,
-    val comment: String
+    val comment: String,
+    val languageCode: String?
 )
 
 // 댓글의 답글 조회 Response 컨테이너

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/comment/CharacterCommentService.kt

@@ -2,7 +2,10 @@ package kr.co.vividnext.sodalive.chat.character.comment
 
 import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterRepository
 import kr.co.vividnext.sodalive.common.SodaException
+import kr.co.vividnext.sodalive.content.LanguageDetectEvent
+import kr.co.vividnext.sodalive.content.LanguageDetectTargetType
 import kr.co.vividnext.sodalive.member.Member
+import org.springframework.context.ApplicationEventPublisher
 import org.springframework.data.domain.PageRequest
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
@@ -12,7 +15,8 @@ import java.time.ZoneId
 class CharacterCommentService(
     private val chatCharacterRepository: ChatCharacterRepository,
     private val commentRepository: CharacterCommentRepository,
-    private val reportRepository: CharacterCommentReportRepository
+    private val reportRepository: CharacterCommentReportRepository,
+    private val applicationEventPublisher: ApplicationEventPublisher
 ) {
 
     private fun profileUrl(imageHost: String, profileImage: String?): String {
@@ -40,7 +44,8 @@ class CharacterCommentService(
             memberNickname = member.nickname,
             createdAt = toEpochMilli(entity.createdAt),
             replyCount = replyCountOverride ?: commentRepository.countByParent_IdAndIsActiveTrue(entity.id!!),
-            comment = entity.comment
+            comment = entity.comment,
+            languageCode = entity.languageCode
         )
     }
 
@@ -52,25 +57,44 @@ class CharacterCommentService(
             memberProfileImage = profileUrl(imageHost, member.profileImage),
             memberNickname = member.nickname,
             createdAt = toEpochMilli(entity.createdAt),
-            comment = entity.comment
+            comment = entity.comment,
+            languageCode = entity.languageCode
         )
     }
 
     @Transactional
-    fun addComment(characterId: Long, member: Member, text: String): Long {
+    fun addComment(characterId: Long, member: Member, text: String, languageCode: String? = null): Long {
         val character = chatCharacterRepository.findById(characterId).orElseThrow { SodaException("캐릭터를 찾을 수 없습니다.") }
         if (!character.isActive) throw SodaException("비활성화된 캐릭터입니다.")
         if (text.isBlank()) throw SodaException("댓글 내용을 입력해주세요.")
 
-        val entity = CharacterComment(comment = text)
+        val entity = CharacterComment(comment = text, languageCode = languageCode)
         entity.chatCharacter = character
         entity.member = member
         commentRepository.save(entity)
+
+        // 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
+        if (languageCode.isNullOrBlank()) {
+            applicationEventPublisher.publishEvent(
+                LanguageDetectEvent(
+                    id = entity.id!!,
+                    query = text,
+                    targetType = LanguageDetectTargetType.CHARACTER_COMMENT
+                )
+            )
+        }
+
         return entity.id!!
     }
 
     @Transactional
-    fun addReply(characterId: Long, parentCommentId: Long, member: Member, text: String): Long {
+    fun addReply(
+        characterId: Long,
+        parentCommentId: Long,
+        member: Member,
+        text: String,
+        languageCode: String? = null
+    ): Long {
         val character = chatCharacterRepository.findById(characterId).orElseThrow { SodaException("캐릭터를 찾을 수 없습니다.") }
         if (!character.isActive) throw SodaException("비활성화된 캐릭터입니다.")
         val parent = commentRepository.findById(parentCommentId).orElseThrow { SodaException("댓글을 찾을 수 없습니다.") }
@@ -78,11 +102,23 @@ class CharacterCommentService(
         if (!parent.isActive) throw SodaException("비활성화된 댓글입니다.")
         if (text.isBlank()) throw SodaException("댓글 내용을 입력해주세요.")
 
-        val entity = CharacterComment(comment = text)
+        val entity = CharacterComment(comment = text, languageCode = languageCode)
         entity.chatCharacter = character
         entity.member = member
         entity.parent = parent
         commentRepository.save(entity)
+
+        // 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
+        if (languageCode.isNullOrBlank()) {
+            applicationEventPublisher.publishEvent(
+                LanguageDetectEvent(
+                    id = entity.id!!,
+                    query = text,
+                    targetType = LanguageDetectTargetType.CHARACTER_COMMENT
+                )
+            )
+        }
+
         return entity.id!!
     }
 

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/controller/ChatCharacterController.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.chat.character.controller
 
 import kr.co.vividnext.sodalive.chat.character.comment.CharacterCommentService
+import kr.co.vividnext.sodalive.chat.character.curation.CharacterCurationQueryService
 import kr.co.vividnext.sodalive.chat.character.dto.Character
 import kr.co.vividnext.sodalive.chat.character.dto.CharacterBackgroundResponse
 import kr.co.vividnext.sodalive.chat.character.dto.CharacterBannerResponse
@@ -10,11 +11,21 @@ import kr.co.vividnext.sodalive.chat.character.dto.CharacterPersonalityResponse
 import kr.co.vividnext.sodalive.chat.character.dto.CurationSection
 import kr.co.vividnext.sodalive.chat.character.dto.OtherCharacter
 import kr.co.vividnext.sodalive.chat.character.dto.RecentCharacter
+import kr.co.vividnext.sodalive.chat.character.dto.RecentCharactersResponse
 import kr.co.vividnext.sodalive.chat.character.service.ChatCharacterBannerService
 import kr.co.vividnext.sodalive.chat.character.service.ChatCharacterService
+import kr.co.vividnext.sodalive.chat.character.translate.AiCharacterTranslation
+import kr.co.vividnext.sodalive.chat.character.translate.AiCharacterTranslationRenderedPayload
+import kr.co.vividnext.sodalive.chat.character.translate.AiCharacterTranslationRepository
+import kr.co.vividnext.sodalive.chat.character.translate.TranslatedAiCharacterBackground
+import kr.co.vividnext.sodalive.chat.character.translate.TranslatedAiCharacterDetail
+import kr.co.vividnext.sodalive.chat.character.translate.TranslatedAiCharacterPersonality
 import kr.co.vividnext.sodalive.chat.room.service.ChatRoomService
 import kr.co.vividnext.sodalive.common.ApiResponse
 import kr.co.vividnext.sodalive.common.SodaException
+import kr.co.vividnext.sodalive.i18n.LangContext
+import kr.co.vividnext.sodalive.i18n.translation.PapagoTranslationService
+import kr.co.vividnext.sodalive.i18n.translation.TranslateRequest
 import kr.co.vividnext.sodalive.member.Member
 import org.springframework.beans.factory.annotation.Value
 import org.springframework.data.domain.PageRequest
@@ -32,7 +43,12 @@ class ChatCharacterController(
     private val bannerService: ChatCharacterBannerService,
     private val chatRoomService: ChatRoomService,
     private val characterCommentService: CharacterCommentService,
-    private val curationQueryService: kr.co.vividnext.sodalive.chat.character.curation.CharacterCurationQueryService,
+    private val curationQueryService: CharacterCurationQueryService,
+
+    private val translationService: PapagoTranslationService,
+    private val aiCharacterTranslationRepository: AiCharacterTranslationRepository,
+
+    private val langContext: LangContext,
 
     @Value("\${cloud.aws.cloud-front.host}")
     private val imageHost: String
@@ -65,6 +81,24 @@ class ChatCharacterController(
                 }
         }
 
+        val characterIds = recentCharacters.map { it.characterId }
+        val translatedRecentCharacters = if (characterIds.isNotEmpty()) {
+            val translations = aiCharacterTranslationRepository
+                .findByCharacterIdInAndLocale(characterIds = characterIds, locale = langContext.lang.code)
+                .associateBy { it.characterId }
+
+            recentCharacters.map { character ->
+                val translatedName = translations[character.characterId]?.renderedPayload?.name
+                if (translatedName.isNullOrBlank()) {
+                    character
+                } else {
+                    character.copy(name = translatedName)
+                }
+            }
+        } else {
+            recentCharacters
+        }
+
         // 인기 캐릭터 조회
         val popularCharacters = service.getPopularCharacters()
 
@@ -103,10 +137,10 @@ class ChatCharacterController(
         ApiResponse.ok(
             CharacterMainResponse(
                 banners = banners,
-                recentCharacters = recentCharacters,
-                popularCharacters = popularCharacters,
-                newCharacters = newCharacters,
-                recommendCharacters = recommendCharacters,
+                recentCharacters = translatedRecentCharacters,
+                popularCharacters = getTranslatedAiCharacterList(popularCharacters),
+                newCharacters = getTranslatedAiCharacterList(newCharacters),
+                recommendCharacters = getTranslatedAiCharacterList(recommendCharacters),
                 curationSections = curationSections
             )
         )
@@ -148,6 +182,118 @@ class ChatCharacterController(
             )
         }
 
+        var translated: TranslatedAiCharacterDetail? = null
+        if (langContext.lang.code != character.languageCode) {
+            val existing = aiCharacterTranslationRepository
+                .findByCharacterIdAndLocale(character.id!!, langContext.lang.code)
+
+            if (existing != null) {
+                val payload = existing.renderedPayload
+                translated = TranslatedAiCharacterDetail(
+                    name = payload.name,
+                    description = payload.description,
+                    gender = payload.gender,
+                    personality = TranslatedAiCharacterPersonality(
+                        trait = payload.personalityTrait,
+                        description = payload.personalityDescription
+                    ).takeIf {
+                        (it.trait?.isNotBlank() == true) || (it.description?.isNotBlank() == true)
+                    },
+                    background = TranslatedAiCharacterBackground(
+                        topic = payload.backgroundTopic,
+                        description = payload.backgroundDescription
+                    ).takeIf {
+                        (it.topic?.isNotBlank() == true) || (it.description?.isNotBlank() == true)
+                    },
+                    tags = payload.tags
+                )
+            } else {
+                val texts = mutableListOf<String>()
+                texts.add(character.name)
+                texts.add(character.description)
+                texts.add(character.gender ?: "")
+
+                val hasPersonality = personality != null
+                if (hasPersonality) {
+                    texts.add(personality!!.trait)
+                    texts.add(personality.description)
+                }
+
+                val hasBackground = background != null
+                if (hasBackground) {
+                    texts.add(background!!.topic)
+                    texts.add(background.description)
+                }
+
+                texts.add(tags)
+
+                val sourceLanguage = character.languageCode ?: "ko"
+
+                val response = translationService.translate(
+                    request = TranslateRequest(
+                        texts = texts,
+                        sourceLanguage = sourceLanguage,
+                        targetLanguage = langContext.lang.code
+                    )
+                )
+
+                val translatedTexts = response.translatedText
+                if (translatedTexts.size == texts.size) {
+                    var index = 0
+
+                    val translatedName = translatedTexts[index++]
+                    val translatedDescription = translatedTexts[index++]
+                    val translatedGender = translatedTexts[index++]
+
+                    var translatedPersonality: TranslatedAiCharacterPersonality? = null
+                    if (hasPersonality) {
+                        translatedPersonality = TranslatedAiCharacterPersonality(
+                            trait = translatedTexts[index++],
+                            description = translatedTexts[index++]
+                        )
+                    }
+
+                    var translatedBackground: TranslatedAiCharacterBackground? = null
+                    if (hasBackground) {
+                        translatedBackground = TranslatedAiCharacterBackground(
+                            topic = translatedTexts[index++],
+                            description = translatedTexts[index++]
+                        )
+                    }
+
+                    val translatedTags = translatedTexts[index]
+
+                    val payload = AiCharacterTranslationRenderedPayload(
+                        name = translatedName,
+                        description = translatedDescription,
+                        gender = translatedGender,
+                        personalityTrait = translatedPersonality?.trait ?: "",
+                        personalityDescription = translatedPersonality?.description ?: "",
+                        backgroundTopic = translatedBackground?.topic ?: "",
+                        backgroundDescription = translatedBackground?.description ?: "",
+                        tags = translatedTags
+                    )
+
+                    val entity = AiCharacterTranslation(
+                        characterId = character.id!!,
+                        locale = langContext.lang.code,
+                        renderedPayload = payload
+                    )
+
+                    aiCharacterTranslationRepository.save(entity)
+
+                    translated = TranslatedAiCharacterDetail(
+                        name = translatedName,
+                        description = translatedDescription,
+                        gender = translatedGender,
+                        personality = translatedPersonality,
+                        background = translatedBackground,
+                        tags = translatedTags
+                    )
+                }
+            }
+        }
+
         // 다른 캐릭터 조회 (태그 기반, 랜덤 10개, 현재 캐릭터 제외)
         val others = service.getOtherCharactersBySharedTags(characterId, 10)
             .map { other ->
@@ -162,6 +308,35 @@ class ChatCharacterController(
                 )
             }
 
+        /**
+         * 다른 캐릭터 이름, 태그 번역 데이터 조회
+         *
+         * languageCode != null
+         * aiCharacterTranslationRepository 이용해 번역 콘텐츠를 조회한다. - characterId, locale
+         *
+         * 한 번에 조회하고 characterId 매핑하여 others 캐릭터 이름과 tags 번역 데이터로 변경한다
+         */
+        val characterIds = others.map { it.characterId }
+        val translatedOthers = if (characterIds.isNotEmpty()) {
+            val translations = aiCharacterTranslationRepository
+                .findByCharacterIdInAndLocale(characterIds = characterIds, locale = langContext.lang.code)
+                .associateBy { it.characterId }
+
+            others.map { other ->
+                val payload = translations[other.characterId]?.renderedPayload
+                val translatedName = payload?.name
+                val translatedTags = payload?.tags
+
+                if (translatedName.isNullOrBlank() || translatedTags.isNullOrBlank()) {
+                    other
+                } else {
+                    other.copy(name = translatedName, tags = translatedTags)
+                }
+            }
+        } else {
+            others
+        }
+
         // 최신 댓글 1개 조회
         val latestComment = characterCommentService.getLatestComment(imageHost, character.id!!)
 
@@ -171,6 +346,7 @@ class ChatCharacterController(
                 characterId = character.id!!,
                 name = character.name,
                 description = character.description,
+                languageCode = character.languageCode,
                 mbti = character.mbti,
                 gender = character.gender,
                 age = character.age,
@@ -181,9 +357,10 @@ class ChatCharacterController(
                 originalTitle = character.originalTitle,
                 originalLink = character.originalLink,
                 characterType = character.characterType,
-                others = others,
+                others = translatedOthers,
                 latestComment = latestComment,
-                totalComments = characterCommentService.getTotalCommentCount(character.id!!)
+                totalComments = characterCommentService.getTotalCommentCount(character.id!!),
+                translated = translated
             )
         )
     }
@@ -194,13 +371,20 @@ class ChatCharacterController(
      * - 예외: 2주 이내 캐릭터가 0개인 경우, 최근 등록한 캐릭터 20개만 제공
      */
     @GetMapping("/recent")
-    fun getRecentCharacters(@RequestParam("page", required = false) page: Int?) = run {
-        ApiResponse.ok(
-            service.getRecentCharactersPage(
-                page = page ?: 0,
-                size = 20
-            )
+    fun getRecentCharacters(
+        @RequestParam("page", required = false) page: Int?
+    ): ApiResponse<RecentCharactersResponse> = run {
+        val characterPage = service.getRecentCharactersPage(
+            page = page ?: 0,
+            size = 20
         )
+
+        val translatedCharacterPage = RecentCharactersResponse(
+            totalCount = characterPage.totalCount,
+            content = getTranslatedAiCharacterList(characterPage.content)
+        )
+
+        ApiResponse.ok(translatedCharacterPage)
     }
 
     /**
@@ -219,6 +403,48 @@ class ChatCharacterController(
                 .listMyChatRooms(member, 0, 50) // 최근 기록은 최대 50개까지만 제외 대상으로 고려
                 .map { it.characterId }
         }
-        ApiResponse.ok(service.getRecommendCharacters(recent, 20))
+
+        ApiResponse.ok(
+            getTranslatedAiCharacterList(
+                service.getRecommendCharacters(
+                    recent,
+                    20
+                )
+            )
+        )
+    }
+
+    /**
+     * AI 캐릭터 리스트의 이름/설명을 현재 언어(locale)에 맞춰 일괄 번역한다.
+     *
+     * 처리 절차:
+     * - characterId 목록을 추출하고, 요청 언어 코드로 aiCharacterTranslationRepository에서
+     *   번역 데이터를 한 번에 조회한다.
+     * - 각 캐릭터에 대해 name과 description 모두 번역 값이 존재하고 비어있지 않을 때에만
+     *   해당 필드를 교체한다. 둘 중 하나라도 없으면 원본 캐릭터를 그대로 유지한다.
+     *
+     * @param aiCharacterList 번역 대상 캐릭터 목록
+     * @return 가능한 경우 name/description이 번역된 캐릭터 목록, 그 외는 원본 유지
+     */
+    private fun getTranslatedAiCharacterList(aiCharacterList: List<Character>): List<Character> {
+        val characterIds = aiCharacterList.map { it.characterId }
+
+        return if (characterIds.isNotEmpty()) {
+            val translations = aiCharacterTranslationRepository
+                .findByCharacterIdInAndLocale(characterIds = characterIds, locale = langContext.lang.code)
+                .associateBy { it.characterId }
+
+            aiCharacterList.map { character ->
+                val translatedName = translations[character.characterId]?.renderedPayload?.name
+                val translatedDesc = translations[character.characterId]?.renderedPayload?.description
+                if (translatedName.isNullOrBlank() || translatedDesc.isNullOrBlank()) {
+                    character
+                } else {
+                    character.copy(name = translatedName, description = translatedDesc)
+                }
+            }
+        } else {
+            aiCharacterList
+        }
     }
 }

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/dto/CharacterDetailResponse.kt

@@ -2,11 +2,13 @@ package kr.co.vividnext.sodalive.chat.character.dto
 
 import kr.co.vividnext.sodalive.chat.character.CharacterType
 import kr.co.vividnext.sodalive.chat.character.comment.CharacterCommentResponse
+import kr.co.vividnext.sodalive.chat.character.translate.TranslatedAiCharacterDetail
 
 data class CharacterDetailResponse(
     val characterId: Long,
     val name: String,
     val description: String,
+    val languageCode: String?,
     val mbti: String?,
     val gender: String?,
     val age: Int?,
@@ -19,7 +21,8 @@ data class CharacterDetailResponse(
     val characterType: CharacterType,
     val others: List<OtherCharacter>,
     val latestComment: CharacterCommentResponse?,
-    val totalComments: Int
+    val totalComments: Int,
+    val translated: TranslatedAiCharacterDetail?
 )
 
 data class OtherCharacter(

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/translate/AiCharacterTranslation.kt

@@ -0,0 +1,87 @@
+package kr.co.vividnext.sodalive.chat.character.translate
+
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import com.fasterxml.jackson.module.kotlin.readValue
+import kr.co.vividnext.sodalive.common.BaseEntity
+import javax.persistence.AttributeConverter
+import javax.persistence.Column
+import javax.persistence.Convert
+import javax.persistence.Converter
+import javax.persistence.Entity
+import javax.persistence.Table
+import javax.persistence.UniqueConstraint
+
+@Entity
+@Table(
+    uniqueConstraints = [
+        UniqueConstraint(columnNames = ["characterId", "locale"])
+    ]
+)
+class AiCharacterTranslation(
+    val characterId: Long,
+    val locale: String,
+
+    @Column(columnDefinition = "json")
+    @Convert(converter = AiCharacterTranslationRenderedPayloadConverter::class)
+    var renderedPayload: AiCharacterTranslationRenderedPayload
+) : BaseEntity()
+
+data class AiCharacterTranslationRenderedPayload(
+    val name: String,
+    val description: String,
+    val gender: String,
+    val personalityTrait: String,
+    val personalityDescription: String,
+    val backgroundTopic: String,
+    val backgroundDescription: String,
+    val tags: String
+)
+
+@Converter(autoApply = false)
+class AiCharacterTranslationRenderedPayloadConverter :
+    AttributeConverter<AiCharacterTranslationRenderedPayload, String> {
+
+    override fun convertToDatabaseColumn(attribute: AiCharacterTranslationRenderedPayload?): String {
+        if (attribute == null) return "{}"
+        return objectMapper.writeValueAsString(attribute)
+    }
+
+    override fun convertToEntityAttribute(dbData: String?): AiCharacterTranslationRenderedPayload {
+        if (dbData.isNullOrBlank()) {
+            return AiCharacterTranslationRenderedPayload(
+                name = "",
+                description = "",
+                gender = "",
+                personalityTrait = "",
+                personalityDescription = "",
+                backgroundTopic = "",
+                backgroundDescription = "",
+                tags = ""
+            )
+        }
+        return objectMapper.readValue(dbData)
+    }
+
+    companion object {
+        private val objectMapper = jacksonObjectMapper()
+    }
+}
+
+data class TranslatedAiCharacterDetail(
+    val name: String?,
+    val description: String?,
+    val gender: String?,
+    val personality: TranslatedAiCharacterPersonality?,
+    val background: TranslatedAiCharacterBackground?,
+    val tags: String?
+)
+
+data class TranslatedAiCharacterPersonality(
+    val trait: String?,
+    val description: String?
+)
+
+data class TranslatedAiCharacterBackground(
+    val topic: String?,
+    val description: String?
+)

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/translate/AiCharacterTranslationRepository.kt

@@ -0,0 +1,9 @@
+package kr.co.vividnext.sodalive.chat.character.translate
+
+import org.springframework.data.jpa.repository.JpaRepository
+
+interface AiCharacterTranslationRepository : JpaRepository<AiCharacterTranslation, Long> {
+    fun findByCharacterIdAndLocale(characterId: Long, locale: String): AiCharacterTranslation?
+
+    fun findByCharacterIdInAndLocale(characterIds: List<Long>, locale: String): List<AiCharacterTranslation>
+}

src/main/kotlin/kr/co/vividnext/sodalive/configs/WebConfig.kt

@@ -1,11 +1,19 @@
 package kr.co.vividnext.sodalive.configs
 
+import kr.co.vividnext.sodalive.i18n.LangInterceptor
 import org.springframework.context.annotation.Configuration
 import org.springframework.web.servlet.config.annotation.CorsRegistry
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer
 
 @Configuration
-class WebConfig : WebMvcConfigurer {
+class WebConfig(
+    private val langInterceptor: LangInterceptor
+) : WebMvcConfigurer {
+    override fun addInterceptors(registry: InterceptorRegistry) {
+        registry.addInterceptor(langInterceptor).addPathPatterns("/**")
+    }
+
     override fun addCorsMappings(registry: CorsRegistry) {
         registry.addMapping("/**")
             .allowedOrigins(

src/main/kotlin/kr/co/vividnext/sodalive/content/AudioContent.kt

@@ -32,6 +32,7 @@ data class AudioContent(
     var title: String,
     @Column(columnDefinition = "TEXT", nullable = false)
     var detail: String,
+    var languageCode: String?,
     var playCount: Long = 0,
     var price: Int = 0,
     var releaseDate: LocalDateTime? = null,

src/main/kotlin/kr/co/vividnext/sodalive/content/AudioContentService.kt

@@ -21,10 +21,20 @@ import kr.co.vividnext.sodalive.content.order.OrderType
 import kr.co.vividnext.sodalive.content.pin.PinContent
 import kr.co.vividnext.sodalive.content.pin.PinContentRepository
 import kr.co.vividnext.sodalive.content.theme.AudioContentThemeQueryRepository
+import kr.co.vividnext.sodalive.content.theme.translation.ContentThemeTranslationRepository
+import kr.co.vividnext.sodalive.content.translation.ContentTranslation
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationPayload
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationRepository
+import kr.co.vividnext.sodalive.content.translation.TranslatedContent
 import kr.co.vividnext.sodalive.explorer.ExplorerQueryRepository
 import kr.co.vividnext.sodalive.extensions.convertLocalDateTime
 import kr.co.vividnext.sodalive.fcm.FcmEvent
 import kr.co.vividnext.sodalive.fcm.FcmEventType
+import kr.co.vividnext.sodalive.i18n.LangContext
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationEvent
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationTargetType
+import kr.co.vividnext.sodalive.i18n.translation.PapagoTranslationService
+import kr.co.vividnext.sodalive.i18n.translation.TranslateRequest
 import kr.co.vividnext.sodalive.member.Member
 import kr.co.vividnext.sodalive.member.block.BlockMemberRepository
 import kr.co.vividnext.sodalive.utils.generateFileName
@@ -56,11 +66,18 @@ class AudioContentService(
     private val audioContentLikeRepository: AudioContentLikeRepository,
     private val pinContentRepository: PinContentRepository,
 
+    private val translationService: PapagoTranslationService,
+    private val contentTranslationRepository: ContentTranslationRepository,
+
     private val s3Uploader: S3Uploader,
     private val objectMapper: ObjectMapper,
     private val audioContentCloudFront: AudioContentCloudFront,
     private val applicationEventPublisher: ApplicationEventPublisher,
 
+    private val langContext: LangContext,
+
+    private val contentThemeTranslationRepository: ContentThemeTranslationRepository,
+
     @Value("\${cloud.aws.s3.content-bucket}")
     private val audioContentBucket: String,
 
@@ -160,6 +177,13 @@ class AudioContentService(
 
             audioContent.audioContentHashTags.addAll(newAudioContentHashTagList)
         }
+
+        applicationEventPublisher.publishEvent(
+            LanguageTranslationEvent(
+                id = request.contentId,
+                targetType = LanguageTranslationTargetType.CONTENT
+            )
+        )
     }
 
     @Transactional
@@ -238,6 +262,7 @@ class AudioContentService(
         val audioContent = AudioContent(
             title = request.title.trim(),
             detail = request.detail.trim(),
+            languageCode = request.languageCode,
             price = if (request.price > 0) {
                 request.price
             } else {
@@ -331,6 +356,31 @@ class AudioContentService(
 
         audioContent.content = contentPath
 
+        // 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
+        if (audioContent.languageCode.isNullOrBlank()) {
+            val papagoQuery = listOf(
+                request.title.trim(),
+                request.detail.trim(),
+                request.tags.trim()
+            )
+                .filter { it.isNotBlank() }
+                .joinToString(" ")
+
+            applicationEventPublisher.publishEvent(
+                LanguageDetectEvent(
+                    id = audioContent.id!!,
+                    query = papagoQuery
+                )
+            )
+        }
+
+        applicationEventPublisher.publishEvent(
+            LanguageTranslationEvent(
+                id = audioContent.id!!,
+                targetType = LanguageTranslationTargetType.CONTENT
+            )
+        )
+
         return CreateAudioContentResponse(contentId = audioContent.id!!)
     }
 
@@ -477,6 +527,7 @@ class AudioContentService(
         }
     }
 
+    @Transactional
     fun getDetail(
         id: Long,
         member: Member,
@@ -699,10 +750,89 @@ class AudioContentService(
             listOf()
         }
 
+        var translated: TranslatedContent? = null
+
+        /**
+         * audioContent.languageCode != languageCode
+         *
+         * 번역 콘텐츠를 조회한다. - contentId, locale
+         * 번역 콘텐츠가 있으면
+         * TranslatedContent로 가공한다
+         *
+         * 번역 콘텐츠가 없으면
+         * 파파고 API를 통해 번역한 후 저장한다.
+         *
+         * 번역 대상: title, detail, tags
+         *
+         * 파파고로 번역한 데이터를 TranslatedContent로 가공한다
+         */
+        if (
+            audioContent.languageCode != null &&
+            audioContent.languageCode!!.isNotBlank() &&
+            audioContent.languageCode != langContext.lang.code
+        ) {
+            val existing = contentTranslationRepository
+                .findByContentIdAndLocale(audioContent.id!!, langContext.lang.code)
+
+            if (existing != null) {
+                val payload = existing.renderedPayload
+                translated = TranslatedContent(
+                    title = payload.title,
+                    detail = payload.detail,
+                    tags = payload.tags
+                )
+            } else {
+                val texts = mutableListOf<String>()
+                texts.add(audioContent.title)
+                texts.add(audioContent.detail)
+                texts.add(tag)
+
+                val sourceLanguage = audioContent.languageCode ?: "ko"
+
+                val response = translationService.translate(
+                    request = TranslateRequest(
+                        texts = texts,
+                        sourceLanguage = sourceLanguage,
+                        targetLanguage = langContext.lang.code
+                    )
+                )
+
+                val translatedTexts = response.translatedText
+                if (translatedTexts.size == texts.size) {
+                    var index = 0
+
+                    val translatedTitle = translatedTexts[index++]
+                    val translatedDetail = translatedTexts[index++]
+                    val translatedTags = translatedTexts[index]
+
+                    val payload = ContentTranslationPayload(
+                        title = translatedTitle,
+                        detail = translatedDetail,
+                        tags = translatedTags
+                    )
+
+                    contentTranslationRepository.save(
+                        ContentTranslation(
+                            contentId = audioContent.id!!,
+                            locale = langContext.lang.code,
+                            renderedPayload = payload
+                        )
+                    )
+
+                    translated = TranslatedContent(
+                        title = translatedTitle,
+                        detail = translatedDetail,
+                        tags = translatedTags
+                    )
+                }
+            }
+        }
+
         return GetAudioContentDetailResponse(
             contentId = audioContent.id!!,
             title = audioContent.title,
             detail = contentDetail,
+            languageCode = audioContent.languageCode,
             coverImageUrl = "$coverImageHost/${audioContent.coverImage!!}",
             contentUrl = audioContentUrl,
             themeStr = audioContent.theme!!.theme,
@@ -745,7 +875,8 @@ class AudioContentService(
             previousContent = previousContent,
             nextContent = nextContent,
             buyerList = buyerList,
-            isAvailableUsePoint = audioContent.isPointAvailable
+            isAvailableUsePoint = audioContent.isPointAvailable,
+            translated = translated
         )
     }
 
@@ -852,9 +983,27 @@ class AudioContentService(
                 it
             }
 
+        val contentIds = items.map { it.contentId }
+        val translatedContentList = if (contentIds.isNotEmpty()) {
+            val translations = contentTranslationRepository
+                .findByContentIdInAndLocale(contentIds = contentIds, locale = langContext.lang.code)
+                .associateBy { it.contentId }
+
+            items.map { item ->
+                val translatedTitle = translations[item.contentId]?.renderedPayload?.title
+                if (translatedTitle.isNullOrBlank()) {
+                    item
+                } else {
+                    item.copy(title = translatedTitle)
+                }
+            }
+        } else {
+            items
+        }
+
         return GetAudioContentListResponse(
             totalCount = totalCount,
-            items = items
+            items = translatedContentList
         )
     }
 
@@ -994,8 +1143,20 @@ class AudioContentService(
         orderByRandom: Boolean = false,
         isPointAvailableOnly: Boolean = false
     ): List<AudioContentMainItem> {
-        return repository.getLatestContentByTheme(
-            theme = theme,
+        /**
+         * - AS-IS theme은 한글만 처리하도록 되어 있음
+         * - TO-BE 번역된 theme이 들어와도 동일한 동작을 하도록 처리
+         */
+        val normalizedTheme = normalizeThemeForQuery(
+            themes = theme,
+            contentType = contentType,
+            isFree = isFree,
+            isAdult = isAdult,
+            isPointAvailableOnly = isPointAvailableOnly
+        )
+
+        val contentList = repository.getLatestContentByTheme(
+            theme = normalizedTheme,
             contentType = contentType,
             offset = offset,
             limit = limit,
@@ -1005,5 +1166,79 @@ class AudioContentService(
             orderByRandom = orderByRandom,
             isPointAvailableOnly = isPointAvailableOnly
         )
+
+        val contentIds = contentList.map { it.contentId }
+        return if (contentIds.isNotEmpty()) {
+            val translations = contentTranslationRepository
+                .findByContentIdInAndLocale(contentIds = contentIds, locale = langContext.lang.code)
+                .associateBy { it.contentId }
+
+            contentList.map { item ->
+                val translatedTitle = translations[item.contentId]?.renderedPayload?.title
+                if (translatedTitle.isNullOrBlank()) {
+                    item
+                } else {
+                    item.copy(title = translatedTitle)
+                }
+            }
+        } else {
+            contentList
+        }
+    }
+
+    /**
+     * theme 파라미터로 번역된 테마명이 들어와도 한글 원문 테마로 조회되도록 정규화한다.
+     * - 현재 언어(locale)에 해당하는 테마 번역 목록을 활성 테마 집합과 매칭하여 역매핑한다.
+     * - 입력이 이미 한글인 경우 그대로 유지한다.
+     * - 매칭 실패 시 원본 값을 유지한다.
+     */
+    private fun normalizeThemeForQuery(
+        themes: List<String>,
+        contentType: ContentType,
+        isFree: Boolean,
+        isAdult: Boolean,
+        isPointAvailableOnly: Boolean
+    ): List<String> {
+        if (themes.isEmpty()) return themes
+
+        val themesWithIds = themeQueryRepository.getActiveThemeWithIdsOfContent(
+            isAdult = isAdult,
+            isFree = isFree,
+            isPointAvailableOnly = isPointAvailableOnly,
+            contentType = contentType
+        )
+
+        if (themesWithIds.isEmpty()) return themes
+
+        val idByKorean = themesWithIds.associate { it.theme to it.id }
+        val koreanById = themesWithIds.associate { it.id to it.theme }
+
+        val locale = langContext.lang.code
+        // 번역 테마를 역매핑하기 위해 현재 locale의 번역 목록을 조회
+        val translatedByTextToId = run {
+            val ids = themesWithIds.map { it.id }
+            if (ids.isEmpty()) {
+                emptyMap()
+            } else {
+                contentThemeTranslationRepository
+                    .findByContentThemeIdInAndLocale(ids, locale)
+                    .associate { it.theme to it.contentThemeId }
+            }
+        }
+
+        return themes.asSequence()
+            .map { input ->
+                when {
+                    idByKorean.containsKey(input) -> input // 이미 한글 원문
+                    translatedByTextToId.containsKey(input) -> {
+                        val id = translatedByTextToId[input]!!
+                        koreanById[id] ?: input
+                    }
+
+                    else -> input
+                }
+            }
+            .distinct()
+            .toList()
     }
 }

src/main/kotlin/kr/co/vividnext/sodalive/content/CreateAudioContentRequest.kt

@@ -17,5 +17,6 @@ data class CreateAudioContentRequest(
     val isCommentAvailable: Boolean = false,
     val isFullDetailVisible: Boolean = true,
     val previewStartTime: String? = null,
-    val previewEndTime: String? = null
+    val previewEndTime: String? = null,
+    val languageCode: String? = null
 )

src/main/kotlin/kr/co/vividnext/sodalive/content/GetAudioContentDetailResponse.kt

@@ -3,11 +3,13 @@ package kr.co.vividnext.sodalive.content
 import com.querydsl.core.annotations.QueryProjection
 import kr.co.vividnext.sodalive.content.comment.GetAudioContentCommentListItem
 import kr.co.vividnext.sodalive.content.order.OrderType
+import kr.co.vividnext.sodalive.content.translation.TranslatedContent
 
 data class GetAudioContentDetailResponse(
     val contentId: Long,
     val title: String,
     val detail: String,
+    val languageCode: String?,
     val coverImageUrl: String,
     val contentUrl: String,
     val themeStr: String,
@@ -39,7 +41,8 @@ data class GetAudioContentDetailResponse(
     val previousContent: OtherContentResponse?,
     val nextContent: OtherContentResponse?,
     val buyerList: List<ContentBuyer>,
-    val isAvailableUsePoint: Boolean
+    val isAvailableUsePoint: Boolean,
+    val translated: TranslatedContent?
 )
 
 data class OtherContentResponse @QueryProjection constructor(

src/main/kotlin/kr/co/vividnext/sodalive/content/LanguageDetectEvent.kt

@@ -0,0 +1,308 @@
+package kr.co.vividnext.sodalive.content
+
+import kr.co.vividnext.sodalive.chat.character.comment.CharacterCommentRepository
+import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterRepository
+import kr.co.vividnext.sodalive.content.comment.AudioContentCommentRepository
+import kr.co.vividnext.sodalive.explorer.profile.CreatorCheersRepository
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationEvent
+import kr.co.vividnext.sodalive.i18n.translation.LanguageTranslationTargetType
+import org.slf4j.LoggerFactory
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.context.ApplicationEventPublisher
+import org.springframework.http.HttpEntity
+import org.springframework.http.HttpHeaders
+import org.springframework.http.MediaType
+import org.springframework.scheduling.annotation.Async
+import org.springframework.stereotype.Component
+import org.springframework.transaction.annotation.Propagation
+import org.springframework.transaction.annotation.Transactional
+import org.springframework.transaction.event.TransactionPhase
+import org.springframework.transaction.event.TransactionalEventListener
+import org.springframework.util.LinkedMultiValueMap
+import org.springframework.web.client.RestTemplate
+
+/**
+ * 텍스트 기반 데이터(콘텐츠, 댓글 등)에 대해 파파고 언어 감지를 요청하기 위한 이벤트.
+ */
+enum class LanguageDetectTargetType {
+    CONTENT,
+    COMMENT,
+    CHARACTER,
+    CHARACTER_COMMENT,
+    CREATOR_CHEERS
+}
+
+class LanguageDetectEvent(
+    val id: Long,
+    val query: String,
+    val targetType: LanguageDetectTargetType = LanguageDetectTargetType.CONTENT
+)
+
+data class PapagoLanguageDetectResponse(
+    val langCode: String?
+)
+
+@Component
+class LanguageDetectListener(
+    private val audioContentRepository: AudioContentRepository,
+    private val audioContentCommentRepository: AudioContentCommentRepository,
+    private val chatCharacterRepository: ChatCharacterRepository,
+    private val characterCommentRepository: CharacterCommentRepository,
+    private val creatorCheersRepository: CreatorCheersRepository,
+
+    private val applicationEventPublisher: ApplicationEventPublisher,
+
+    @Value("\${cloud.naver.papago-client-id}")
+    private val papagoClientId: String,
+
+    @Value("\${cloud.naver.papago-client-secret}")
+    private val papagoClientSecret: String
+) {
+
+    private val log = LoggerFactory.getLogger(LanguageDetectListener::class.java)
+
+    private val restTemplate: RestTemplate = RestTemplate()
+
+    private val papagoDetectUrl = "https://papago.apigw.ntruss.com/langs/v1/dect"
+
+    @Async
+    @TransactionalEventListener(phase = TransactionPhase.AFTER_COMMIT)
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    fun detectLanguage(event: LanguageDetectEvent) {
+        if (event.query.isBlank()) {
+            log.debug("[PapagoLanguageDetect] query is blank. Skip language detection. event={}", event)
+            return
+        }
+
+        when (event.targetType) {
+            LanguageDetectTargetType.CONTENT -> handleContentLanguageDetect(event)
+            LanguageDetectTargetType.COMMENT -> handleCommentLanguageDetect(event)
+            LanguageDetectTargetType.CHARACTER -> handleCharacterLanguageDetect(event)
+            LanguageDetectTargetType.CHARACTER_COMMENT -> handleCharacterCommentLanguageDetect(event)
+            LanguageDetectTargetType.CREATOR_CHEERS -> handleCreatorCheersLanguageDetect(event)
+        }
+    }
+
+    private fun handleCharacterLanguageDetect(event: LanguageDetectEvent) {
+        val characterId = event.id
+
+        val character = chatCharacterRepository.findById(characterId).orElse(null)
+        if (character == null) {
+            log.warn("[PapagoLanguageDetect] ChatCharacter not found. characterId={}", characterId)
+            return
+        }
+
+        // 이미 언어 코드가 설정된 경우 호출하지 않음
+        if (!character.languageCode.isNullOrBlank()) {
+            log.debug(
+                "[PapagoLanguageDetect] languageCode already set. Skip language detection. characterId={}, languageCode={}",
+                characterId,
+                character.languageCode
+            )
+            return
+        }
+
+        val langCode = requestPapagoLanguageCode(event.query, characterId) ?: return
+
+        character.languageCode = langCode
+        chatCharacterRepository.save(character)
+
+        applicationEventPublisher.publishEvent(
+            LanguageTranslationEvent(
+                id = characterId,
+                targetType = LanguageTranslationTargetType.CHARACTER
+            )
+        )
+
+        log.info(
+            "[PapagoLanguageDetect] languageCode updated from Papago. characterId={}, langCode={}",
+            characterId,
+            langCode
+        )
+    }
+
+    private fun handleContentLanguageDetect(event: LanguageDetectEvent) {
+        val contentId = event.id
+
+        val audioContent = audioContentRepository.findById(contentId).orElse(null)
+        if (audioContent == null) {
+            log.warn("[PapagoLanguageDetect] AudioContent not found. contentId={}", contentId)
+            return
+        }
+
+        // 이미 언어 코드가 설정된 경우 호출하지 않음
+        if (!audioContent.languageCode.isNullOrBlank()) {
+            log.debug(
+                "[PapagoLanguageDetect] languageCode already set. Skip language detection. contentId={}, languageCode={}",
+                contentId,
+                audioContent.languageCode
+            )
+            return
+        }
+
+        val langCode = requestPapagoLanguageCode(event.query, contentId) ?: return
+
+        audioContent.languageCode = langCode
+
+        // REQUIRES_NEW 트랜잭션 내에서 변경 내용을 저장한다.
+        audioContentRepository.save(audioContent)
+
+        applicationEventPublisher.publishEvent(
+            LanguageTranslationEvent(
+                id = contentId,
+                targetType = LanguageTranslationTargetType.CONTENT
+            )
+        )
+
+        log.info(
+            "[PapagoLanguageDetect] languageCode updated from Papago. contentId={}, langCode={}",
+            contentId,
+            langCode
+        )
+    }
+
+    private fun handleCommentLanguageDetect(event: LanguageDetectEvent) {
+        val commentId = event.id
+
+        val comment = audioContentCommentRepository.findById(commentId).orElse(null)
+        if (comment == null) {
+            log.warn("[PapagoLanguageDetect] AudioContentComment not found. commentId={}", commentId)
+            return
+        }
+
+        // 이미 언어 코드가 설정된 경우 호출하지 않음
+        if (!comment.languageCode.isNullOrBlank()) {
+            log.debug(
+                "[PapagoLanguageDetect] languageCode already set. Skip language detection. commentId={}, languageCode={}",
+                commentId,
+                comment.languageCode
+            )
+            return
+        }
+
+        val langCode = requestPapagoLanguageCode(event.query, commentId) ?: return
+
+        comment.languageCode = langCode
+        audioContentCommentRepository.save(comment)
+
+        log.info(
+            "[PapagoLanguageDetect] languageCode updated from Papago. commentId={}, langCode={}",
+            commentId,
+            langCode
+        )
+    }
+
+    private fun handleCharacterCommentLanguageDetect(event: LanguageDetectEvent) {
+        val commentId = event.id
+
+        val comment = characterCommentRepository.findById(commentId).orElse(null)
+        if (comment == null) {
+            log.warn("[PapagoLanguageDetect] CharacterComment not found. commentId={}", commentId)
+            return
+        }
+
+        // 이미 언어 코드가 설정된 경우 호출하지 않음
+        if (!comment.languageCode.isNullOrBlank()) {
+            log.debug(
+                "[PapagoLanguageDetect] languageCode already set. Skip language detection. " +
+                    "characterCommentId={}, languageCode={}",
+                commentId,
+                comment.languageCode
+            )
+            return
+        }
+
+        val langCode = requestPapagoLanguageCode(event.query, commentId) ?: return
+
+        comment.languageCode = langCode
+        characterCommentRepository.save(comment)
+
+        log.info(
+            "[PapagoLanguageDetect] languageCode updated from Papago. characterCommentId={}, langCode={}",
+            commentId,
+            langCode
+        )
+    }
+
+    private fun handleCreatorCheersLanguageDetect(event: LanguageDetectEvent) {
+        val cheersId = event.id
+
+        val cheers = creatorCheersRepository.findById(cheersId).orElse(null)
+        if (cheers == null) {
+            log.warn("[PapagoLanguageDetect] CreatorCheers not found. cheersId={}", cheersId)
+            return
+        }
+
+        // 이미 언어 코드가 설정된 경우 호출하지 않음
+        if (!cheers.languageCode.isNullOrBlank()) {
+            log.debug(
+                "[PapagoLanguageDetect] languageCode already set. Skip language detection. cheersId={}, languageCode={}",
+                cheersId,
+                cheers.languageCode
+            )
+            return
+        }
+
+        val langCode = requestPapagoLanguageCode(event.query, cheersId) ?: return
+
+        cheers.languageCode = langCode
+        creatorCheersRepository.save(cheers)
+
+        log.info(
+            "[PapagoLanguageDetect] languageCode updated from Papago. cheersId={}, langCode={}",
+            cheersId,
+            langCode
+        )
+    }
+
+    private fun requestPapagoLanguageCode(query: String, targetIdForLog: Long): String? {
+        return try {
+            val headers = HttpHeaders().apply {
+                contentType = MediaType.APPLICATION_FORM_URLENCODED
+                set("X-NCP-APIGW-API-KEY-ID", papagoClientId)
+                set("X-NCP-APIGW-API-KEY", papagoClientSecret)
+            }
+
+            val body = LinkedMultiValueMap<String, String>().apply {
+                // 파파고 스펙에 따라 query 파라미터에 텍스트를 공백으로 구분하여 전달
+                add("query", query)
+            }
+
+            val requestEntity = HttpEntity(body, headers)
+
+            val response = restTemplate.postForEntity(
+                papagoDetectUrl,
+                requestEntity,
+                PapagoLanguageDetectResponse::class.java
+            )
+
+            if (!response.statusCode.is2xxSuccessful) {
+                log.warn(
+                    "[PapagoLanguageDetect] Non-success status from Papago. status={}, targetId={}",
+                    response.statusCode,
+                    targetIdForLog
+                )
+                return null
+            }
+
+            val langCode = response.body?.langCode?.takeIf { it.isNotBlank() }
+            if (langCode == null) {
+                log.warn(
+                    "[PapagoLanguageDetect] langCode is null or blank in Papago response. targetId={}",
+                    targetIdForLog
+                )
+                return null
+            }
+
+            langCode
+        } catch (ex: Exception) {
+            // 언어 감지는 부가 기능이므로, 실패 시 예외를 전파하지 않고 로그만 남긴다.
+            log.error(
+                "[PapagoLanguageDetect] Failed to detect language via Papago. targetId={}",
+                targetIdForLog,
+                ex
+            )
+            null
+        }
+    }
+}

src/main/kotlin/kr/co/vividnext/sodalive/content/comment/AudioContentComment.kt

@@ -16,6 +16,7 @@ import javax.persistence.Table
 data class AudioContentComment(
     @Column(columnDefinition = "TEXT", nullable = false)
     var comment: String,
+    var languageCode: String?,
     @Column(nullable = true)
     var donationCan: Int? = null,
     val isSecret: Boolean = false,

src/main/kotlin/kr/co/vividnext/sodalive/content/comment/AudioContentCommentController.kt

@@ -32,7 +32,8 @@ class AudioContentCommentController(
             audioContentId = request.contentId,
             parentId = request.parentId,
             isSecret = request.isSecret,
-            member = member
+            member = member,
+            languageCode = request.languageCode
         )
 
         try {

src/main/kotlin/kr/co/vividnext/sodalive/content/comment/AudioContentCommentRepository.kt

@@ -85,6 +85,7 @@ class AudioContentCommentQueryRepositoryImpl(
                     audioContentComment.member.nickname,
                     audioContentComment.member.profileImage.prepend("/").prepend(cloudFrontHost),
                     audioContentComment.comment,
+                    audioContentComment.languageCode,
                     audioContentComment.isSecret,
                     audioContentComment.donationCan.coalesce(0),
                     formattedDate,
@@ -166,6 +167,7 @@ class AudioContentCommentQueryRepositoryImpl(
                     audioContentComment.member.nickname,
                     audioContentComment.member.profileImage.prepend("/").prepend(cloudFrontHost),
                     audioContentComment.comment,
+                    audioContentComment.languageCode,
                     audioContentComment.isSecret,
                     audioContentComment.donationCan.coalesce(0),
                     formattedDate,

src/main/kotlin/kr/co/vividnext/sodalive/content/comment/AudioContentCommentService.kt

@@ -2,6 +2,8 @@ package kr.co.vividnext.sodalive.content.comment
 
 import kr.co.vividnext.sodalive.common.SodaException
 import kr.co.vividnext.sodalive.content.AudioContentRepository
+import kr.co.vividnext.sodalive.content.LanguageDetectEvent
+import kr.co.vividnext.sodalive.content.LanguageDetectTargetType
 import kr.co.vividnext.sodalive.content.order.OrderRepository
 import kr.co.vividnext.sodalive.fcm.FcmEvent
 import kr.co.vividnext.sodalive.fcm.FcmEventType
@@ -32,7 +34,8 @@ class AudioContentCommentService(
         comment: String,
         audioContentId: Long,
         parentId: Long? = null,
-        isSecret: Boolean = false
+        isSecret: Boolean = false,
+        languageCode: String?
     ): Long {
         val audioContent = audioContentRepository.findByIdOrNull(id = audioContentId)
             ?: throw SodaException("잘못된 콘텐츠 입니다.\n다시 시도해 주세요.")
@@ -50,7 +53,7 @@ class AudioContentCommentService(
             throw SodaException("콘텐츠 구매 후 비밀댓글을 등록할 수 있습니다.")
         }
 
-        val audioContentComment = AudioContentComment(comment = comment, isSecret = isSecret)
+        val audioContentComment = AudioContentComment(comment = comment, languageCode = languageCode, isSecret = isSecret)
         audioContentComment.audioContent = audioContent
         audioContentComment.member = member
 
@@ -85,6 +88,17 @@ class AudioContentCommentService(
             )
         )
 
+        // 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
+        if (languageCode.isNullOrBlank()) {
+            applicationEventPublisher.publishEvent(
+                LanguageDetectEvent(
+                    id = savedContentComment.id!!,
+                    query = comment,
+                    targetType = LanguageDetectTargetType.COMMENT
+                )
+            )
+        }
+
         return savedContentComment.id!!
     }
 

src/main/kotlin/kr/co/vividnext/sodalive/content/comment/GetAudioContentCommentListResponse.kt

@@ -13,6 +13,7 @@ data class GetAudioContentCommentListItem @QueryProjection constructor(
     val nickname: String,
     val profileUrl: String,
     val comment: String,
+    val languageCode: String?,
     val isSecret: Boolean,
     val donationCan: Int,
     val date: String,

src/main/kotlin/kr/co/vividnext/sodalive/content/comment/RegisterCommentRequest.kt

@@ -4,5 +4,6 @@ data class RegisterCommentRequest(
     val comment: String,
     val contentId: Long,
     val parentId: Long?,
-    val isSecret: Boolean = false
+    val isSecret: Boolean = false,
+    val languageCode: String? = null
 )

src/main/kotlin/kr/co/vividnext/sodalive/content/donation/AudioContentDonationRequest.kt

@@ -4,5 +4,6 @@ data class AudioContentDonationRequest(
     val contentId: Long,
     val donationCan: Int,
     val comment: String,
-    val container: String
+    val container: String,
+    val languageCode: String? = null
 )

src/main/kotlin/kr/co/vividnext/sodalive/content/donation/AudioContentDonationService.kt

@@ -4,9 +4,12 @@ import kr.co.vividnext.sodalive.can.payment.CanPaymentService
 import kr.co.vividnext.sodalive.can.use.CanUsage
 import kr.co.vividnext.sodalive.common.SodaException
 import kr.co.vividnext.sodalive.content.AudioContentRepository
+import kr.co.vividnext.sodalive.content.LanguageDetectEvent
+import kr.co.vividnext.sodalive.content.LanguageDetectTargetType
 import kr.co.vividnext.sodalive.content.comment.AudioContentComment
 import kr.co.vividnext.sodalive.content.comment.AudioContentCommentRepository
 import kr.co.vividnext.sodalive.member.Member
+import org.springframework.context.ApplicationEventPublisher
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
 
@@ -14,7 +17,8 @@ import org.springframework.transaction.annotation.Transactional
 class AudioContentDonationService(
     private val canPaymentService: CanPaymentService,
     private val queryRepository: AudioContentRepository,
-    private val commentRepository: AudioContentCommentRepository
+    private val commentRepository: AudioContentCommentRepository,
+    private val applicationEventPublisher: ApplicationEventPublisher
 ) {
     @Transactional
     fun donation(request: AudioContentDonationRequest, member: Member) {
@@ -34,10 +38,23 @@ class AudioContentDonationService(
 
         val audioContentComment = AudioContentComment(
             comment = request.comment,
+            languageCode = request.languageCode,
             donationCan = request.donationCan
         )
         audioContentComment.audioContent = audioContent
         audioContentComment.member = member
-        commentRepository.save(audioContentComment)
+
+        val savedComment = commentRepository.save(audioContentComment)
+
+        // 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
+        if (request.languageCode.isNullOrBlank()) {
+            applicationEventPublisher.publishEvent(
+                LanguageDetectEvent(
+                    id = savedComment.id!!,
+                    query = request.comment,
+                    targetType = LanguageDetectTargetType.COMMENT
+                )
+            )
+        }
     }
 }

src/main/kotlin/kr/co/vividnext/sodalive/content/main/AudioContentMainService.kt

@@ -6,7 +6,11 @@ import kr.co.vividnext.sodalive.content.main.banner.AudioContentBannerType
 import kr.co.vividnext.sodalive.content.main.banner.GetAudioContentBannerResponse
 import kr.co.vividnext.sodalive.content.main.curation.GetAudioContentCurationResponse
 import kr.co.vividnext.sodalive.content.theme.AudioContentThemeQueryRepository
+import kr.co.vividnext.sodalive.content.theme.AudioContentThemeService
+import kr.co.vividnext.sodalive.content.theme.translation.ContentThemeTranslationRepository
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationRepository
 import kr.co.vividnext.sodalive.event.EventItem
+import kr.co.vividnext.sodalive.i18n.LangContext
 import kr.co.vividnext.sodalive.member.Member
 import kr.co.vividnext.sodalive.member.block.BlockMemberRepository
 import org.springframework.beans.factory.annotation.Value
@@ -20,14 +24,33 @@ class AudioContentMainService(
     private val repository: AudioContentRepository,
     private val blockMemberRepository: BlockMemberRepository,
     private val audioContentThemeRepository: AudioContentThemeQueryRepository,
+    private val audioContentThemeService: AudioContentThemeService,
+
+    private val contentThemeTranslationRepository: ContentThemeTranslationRepository,
+
+    private val contentTranslationRepository: ContentTranslationRepository,
+
+    private val langContext: LangContext,
 
     @Value("\${cloud.aws.cloud-front.host}")
     private val imageHost: String
 ) {
     @Transactional(readOnly = true)
-    @Cacheable(cacheNames = ["default"], key = "'themeList:' + ':' + #isAdult")
     fun getThemeList(isAdult: Boolean, contentType: ContentType): List<String> {
-        return audioContentThemeRepository.getActiveThemeOfContent(isAdult = isAdult, contentType = contentType)
+        /**
+         * 콘텐츠 테마 조회
+         *
+         * - langContext에 따라 기본 한국어 데이터 혹은 번역된 콘텐츠 테마를 조회해야 함
+         *
+         * - 번역된 테마 데이터가 없다면 번역하여 반환
+         * - 번역된 데이터가 있다면 번역된 데이터를 조회하여 반환
+         */
+        // 표시용 테마 목록은 언어 컨텍스트에 따라 번역된 값을 반환해야 한다.
+        // AudioContentThemeService가 번역/저장을 처리하므로 이를 사용한다.
+        return audioContentThemeService.getActiveThemeOfContent(
+            isAdult = isAdult,
+            contentType = contentType
+        )
     }
 
     @Transactional(readOnly = true)
@@ -60,8 +83,12 @@ class AudioContentMainService(
         member: Member,
         pageable: Pageable
     ): GetNewContentAllResponse {
+        /**
+         * - AS-IS theme은 한글만 처리하도록 되어 있음
+         * - TO-BE 번역된 theme이 들어와도 동일한 동작을 하도록 처리
+         */
         val isAdult = member.auth != null && isAdultContentVisible
-        val themeList = if (theme.isBlank()) {
+        val themeListRaw = if (theme.isBlank()) {
             audioContentThemeRepository.getActiveThemeOfContent(
                 isAdult = isAdult,
                 contentType = contentType
@@ -70,13 +97,19 @@ class AudioContentMainService(
             listOf(theme)
         }
 
+        val themeList = normalizeThemeForQuery(
+            themes = themeListRaw,
+            contentType = contentType,
+            isAdult = isAdult
+        )
+
         val totalCount = repository.totalCountNewContentFor2Weeks(
             themeList,
             memberId = member.id!!,
             isAdult = isAdult,
             contentType = contentType
         )
-        val items = repository.findByThemeFor2Weeks(
+        val contentList = repository.findByThemeFor2Weeks(
             cloudfrontHost = imageHost,
             memberId = member.id!!,
             theme = themeList,
@@ -87,7 +120,75 @@ class AudioContentMainService(
         )
             .filter { !blockMemberRepository.isBlocked(blockedMemberId = member.id!!, memberId = it.creatorId) }
 
-        return GetNewContentAllResponse(totalCount, items)
+        val contentIds = contentList.map { it.contentId }
+        val translatedContentList = if (contentIds.isNotEmpty()) {
+            val translations = contentTranslationRepository
+                .findByContentIdInAndLocale(contentIds = contentIds, locale = langContext.lang.code)
+                .associateBy { it.contentId }
+
+            contentList.map { item ->
+                val translatedTitle = translations[item.contentId]?.renderedPayload?.title
+                if (translatedTitle.isNullOrBlank()) {
+                    item
+                } else {
+                    item.copy(title = translatedTitle)
+                }
+            }
+        } else {
+            contentList
+        }
+
+        return GetNewContentAllResponse(totalCount, translatedContentList)
+    }
+
+    /**
+     * 번역된 테마명이 들어와도 한글 원문 테마로 조회되도록 정규화한다.
+     */
+    private fun normalizeThemeForQuery(
+        themes: List<String>,
+        contentType: ContentType,
+        isAdult: Boolean
+    ): List<String> {
+        if (themes.isEmpty()) return themes
+
+        val themesWithIds = audioContentThemeRepository.getActiveThemeWithIdsOfContent(
+            isAdult = isAdult,
+            isFree = false,
+            isPointAvailableOnly = false,
+            contentType = contentType
+        )
+
+        if (themesWithIds.isEmpty()) return themes
+
+        val idByKorean = themesWithIds.associate { it.theme to it.id }
+        val koreanById = themesWithIds.associate { it.id to it.theme }
+
+        val locale = langContext.lang.code
+        val translatedByTextToId = run {
+            val ids = themesWithIds.map { it.id }
+            if (ids.isEmpty()) {
+                emptyMap()
+            } else {
+                contentThemeTranslationRepository
+                    .findByContentThemeIdInAndLocale(ids, locale)
+                    .associate { it.theme to it.contentThemeId }
+            }
+        }
+
+        return themes.asSequence()
+            .map { input ->
+                when {
+                    idByKorean.containsKey(input) -> input
+                    translatedByTextToId.containsKey(input) -> {
+                        val id = translatedByTextToId[input]!!
+                        koreanById[id] ?: input
+                    }
+
+                    else -> input
+                }
+            }
+            .distinct()
+            .toList()
     }
 
     @Transactional(readOnly = true)

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/AudioContentTheme.kt

@@ -7,7 +7,7 @@ import javax.persistence.Table
 
 @Entity
 @Table(name = "content_theme")
-data class AudioContentTheme(
+class AudioContentTheme(
     @Column(nullable = false)
     var theme: String,
     @Column(nullable = false)

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/AudioContentThemeQueryRepository.kt

@@ -15,6 +15,10 @@ class AudioContentThemeQueryRepository(
     @Value("\${cloud.aws.cloud-front.host}")
     private val cloudFrontHost: String
 ) {
+    data class ThemeIdAndName(
+        val id: Long,
+        val theme: String
+    )
     fun getActiveThemes(): List<GetAudioContentThemeResponse> {
         return queryFactory
             .select(
@@ -88,6 +92,69 @@ class AudioContentThemeQueryRepository(
         return query.fetch()
     }
 
+    fun getActiveThemeWithIdsOfContent(
+        isAdult: Boolean = false,
+        isFree: Boolean = false,
+        isPointAvailableOnly: Boolean = false,
+        contentType: ContentType
+    ): List<ThemeIdAndName> {
+        var where = audioContent.isActive.isTrue
+            .and(audioContentTheme.isActive.isTrue)
+
+        if (!isAdult) {
+            where = where.and(audioContent.isAdult.isFalse)
+        } else {
+            if (contentType != ContentType.ALL) {
+                where = where.and(
+                    audioContent.member.isNull.or(
+                        audioContent.member.auth.gender.eq(
+                            if (contentType == ContentType.MALE) {
+                                0
+                            } else {
+                                1
+                            }
+                        )
+                    )
+                )
+            }
+        }
+
+        if (isFree) {
+            where = where.and(audioContent.price.loe(0))
+        }
+
+        if (isPointAvailableOnly) {
+            where = where.and(audioContent.isPointAvailable.isTrue)
+        }
+
+        val query = queryFactory
+            .select(audioContentTheme.id, audioContentTheme.theme)
+            .from(audioContent)
+            .innerJoin(audioContent.member, member)
+            .innerJoin(audioContent.theme, audioContentTheme)
+            .where(where)
+            .groupBy(audioContentTheme.id)
+
+        if (isFree) {
+            query.orderBy(
+                CaseBuilder()
+                    .`when`(audioContentTheme.theme.eq("자기소개")).then(0)
+                    .otherwise(1)
+                    .asc(),
+                audioContentTheme.orders.asc()
+            )
+        } else {
+            query.orderBy(audioContentTheme.orders.asc())
+        }
+
+        return query.fetch().map { tuple ->
+            ThemeIdAndName(
+                id = tuple.get(audioContentTheme.id)!!,
+                theme = tuple.get(audioContentTheme.theme)!!
+            )
+        }
+    }
+
     fun findThemeByIdAndActive(id: Long): AudioContentTheme? {
         return queryFactory
             .selectFrom(audioContentTheme)

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/AudioContentThemeService.kt

@@ -5,6 +5,12 @@ import kr.co.vividnext.sodalive.content.AudioContentRepository
 import kr.co.vividnext.sodalive.content.ContentType
 import kr.co.vividnext.sodalive.content.SortType
 import kr.co.vividnext.sodalive.content.theme.content.GetContentByThemeResponse
+import kr.co.vividnext.sodalive.content.theme.translation.ContentThemeTranslation
+import kr.co.vividnext.sodalive.content.theme.translation.ContentThemeTranslationRepository
+import kr.co.vividnext.sodalive.i18n.Lang
+import kr.co.vividnext.sodalive.i18n.LangContext
+import kr.co.vividnext.sodalive.i18n.translation.PapagoTranslationService
+import kr.co.vividnext.sodalive.i18n.translation.TranslateRequest
 import kr.co.vividnext.sodalive.member.Member
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
@@ -12,26 +18,94 @@ import org.springframework.transaction.annotation.Transactional
 @Service
 class AudioContentThemeService(
     private val queryRepository: AudioContentThemeQueryRepository,
-    private val contentRepository: AudioContentRepository
+    private val contentRepository: AudioContentRepository,
+    private val contentThemeTranslationRepository: ContentThemeTranslationRepository,
+
+    private val papagoTranslationService: PapagoTranslationService,
+    private val langContext: LangContext
 ) {
     @Transactional(readOnly = true)
     fun getThemes(): List<GetAudioContentThemeResponse> {
         return queryRepository.getActiveThemes()
     }
 
-    @Transactional(readOnly = true)
+    @Transactional
     fun getActiveThemeOfContent(
         isAdult: Boolean = false,
         isFree: Boolean = false,
         isPointAvailableOnly: Boolean = false,
         contentType: ContentType
     ): List<String> {
-        return queryRepository.getActiveThemeOfContent(
+        val themesWithIds = queryRepository.getActiveThemeWithIdsOfContent(
             isAdult = isAdult,
             isFree = isFree,
             isPointAvailableOnly = isPointAvailableOnly,
             contentType = contentType
         )
+
+        /**
+         * langContext.lang == Lang.EN || Lang.JA 일 때 번역된 콘텐츠 테마 반환
+         * 번역이 없으면 번역 API 호출 후 저장하고 반환
+         */
+        val currentLang = langContext.lang
+        if (currentLang == Lang.EN || currentLang == Lang.JA) {
+            val targetLocale = currentLang.code
+            // 1) 기존 번역을 한 번에 조회
+            val ids = themesWithIds.map { it.id }
+            val existingTranslations = if (ids.isNotEmpty()) {
+                contentThemeTranslationRepository.findByContentThemeIdInAndLocale(ids, targetLocale)
+            } else {
+                emptyList()
+            }
+
+            val existingMap = existingTranslations.associateBy { it.contentThemeId }
+
+            // 2) 미번역 항목만 수집하여 한 번에 번역 요청
+            val untranslatedPairs = themesWithIds.filter { existingMap[it.id] == null }
+
+            if (untranslatedPairs.isNotEmpty()) {
+                val texts = untranslatedPairs.map { it.theme }
+
+                val response = papagoTranslationService.translate(
+                    request = TranslateRequest(
+                        texts = texts,
+                        sourceLanguage = "ko",
+                        targetLanguage = targetLocale
+                    )
+                )
+
+                val translatedTexts = response.translatedText
+                val entitiesToSave = mutableListOf<ContentThemeTranslation>()
+
+                // translatedTexts 크기가 다르면 안전하게 원문으로 대체
+                untranslatedPairs.forEachIndexed { index, pair ->
+                    val translated = translatedTexts.getOrNull(index) ?: pair.theme
+                    entitiesToSave.add(
+                        ContentThemeTranslation(
+                            contentThemeId = pair.id,
+                            locale = targetLocale,
+                            theme = translated
+                        )
+                    )
+                }
+
+                if (entitiesToSave.isNotEmpty()) {
+                    contentThemeTranslationRepository.saveAll(entitiesToSave)
+                }
+
+                // 저장 후 맵을 갱신
+                entitiesToSave.forEach { entity ->
+                    (existingMap as MutableMap)[entity.contentThemeId] = entity
+                }
+            }
+
+            // 3) 원래 순서대로 결과 조립 (번역 없으면 원문 fallback)
+            return themesWithIds.map { pair ->
+                existingMap[pair.id]?.theme ?: pair.theme
+            }
+        }
+
+        return themesWithIds.map { it.theme }
     }
 
     @Transactional(readOnly = true)

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/translation/ContentThemeTranslation.kt

@@ -0,0 +1,11 @@
+package kr.co.vividnext.sodalive.content.theme.translation
+
+import kr.co.vividnext.sodalive.common.BaseEntity
+import javax.persistence.Entity
+
+@Entity
+class ContentThemeTranslation(
+    val contentThemeId: Long,
+    val locale: String,
+    var theme: String
+) : BaseEntity()

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/translation/ContentThemeTranslationRepository.kt

@@ -0,0 +1,9 @@
+package kr.co.vividnext.sodalive.content.theme.translation
+
+import org.springframework.data.jpa.repository.JpaRepository
+
+interface ContentThemeTranslationRepository : JpaRepository<ContentThemeTranslation, Long> {
+    fun findByContentThemeIdAndLocale(contentThemeId: Long, locale: String): ContentThemeTranslation?
+
+    fun findByContentThemeIdInAndLocale(contentThemeIds: Collection<Long>, locale: String): List<ContentThemeTranslation>
+}

src/main/kotlin/kr/co/vividnext/sodalive/content/translation/ContentTranslation.kt

@@ -0,0 +1,63 @@
+package kr.co.vividnext.sodalive.content.translation
+
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import com.fasterxml.jackson.module.kotlin.readValue
+import kr.co.vividnext.sodalive.common.BaseEntity
+import javax.persistence.AttributeConverter
+import javax.persistence.Column
+import javax.persistence.Convert
+import javax.persistence.Converter
+import javax.persistence.Entity
+import javax.persistence.Table
+import javax.persistence.UniqueConstraint
+
+@Entity
+@Table(
+    uniqueConstraints = [
+        UniqueConstraint(columnNames = ["contentId", "locale"])
+    ]
+)
+class ContentTranslation(
+    val contentId: Long,
+    val locale: String,
+
+    @Column(columnDefinition = "json")
+    @Convert(converter = ContentTranslationPayloadConverter::class)
+    var renderedPayload: ContentTranslationPayload
+) : BaseEntity()
+
+data class ContentTranslationPayload(
+    val title: String,
+    val detail: String,
+    val tags: String
+)
+
+@Converter(autoApply = false)
+class ContentTranslationPayloadConverter : AttributeConverter<ContentTranslationPayload, String> {
+
+    override fun convertToDatabaseColumn(attribute: ContentTranslationPayload?): String {
+        if (attribute == null) return "{}"
+        return objectMapper.writeValueAsString(attribute)
+    }
+
+    override fun convertToEntityAttribute(dbData: String?): ContentTranslationPayload {
+        if (dbData.isNullOrBlank()) {
+            return ContentTranslationPayload(
+                title = "",
+                detail = "",
+                tags = ""
+            )
+        }
+        return objectMapper.readValue(dbData)
+    }
+
+    companion object {
+        private val objectMapper = jacksonObjectMapper()
+    }
+}
+
+data class TranslatedContent(
+    val title: String?,
+    val detail: String?,
+    val tags: String?
+)

src/main/kotlin/kr/co/vividnext/sodalive/content/translation/ContentTranslationRepository.kt

@@ -0,0 +1,9 @@
+package kr.co.vividnext.sodalive.content.translation
+
+import org.springframework.data.jpa.repository.JpaRepository
+
+interface ContentTranslationRepository : JpaRepository<ContentTranslation, Long> {
+    fun findByContentIdAndLocale(contentId: Long, locale: String): ContentTranslation?
+
+    fun findByContentIdInAndLocale(contentIds: List<Long>, locale: String): List<ContentTranslation>
+}

src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerQueryRepository.kt

@@ -488,6 +488,7 @@ class ExplorerQueryRepository(
                         "$cloudFrontHost/profile/default-profile.png"
                     },
                     content = it.cheers,
+                    languageCode = it.languageCode,
                     date = date.format(DateTimeFormatter.ofPattern("yyyy.MM.dd E hh:mm a")),
                     replyList = it.children.asSequence()
                         .map { cheers ->
@@ -505,6 +506,7 @@ class ExplorerQueryRepository(
                                     "$cloudFrontHost/profile/default-profile.png"
                                 },
                                 content = cheers.cheers,
+                                languageCode = cheers.languageCode,
                                 date = replyDate.format(DateTimeFormatter.ofPattern("yyyy.MM.dd E hh:mm a")),
                                 replyList = listOf()
                             )

src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerService.kt

@@ -3,8 +3,11 @@ package kr.co.vividnext.sodalive.explorer
 import kr.co.vividnext.sodalive.common.SodaException
 import kr.co.vividnext.sodalive.content.AudioContentService
 import kr.co.vividnext.sodalive.content.ContentType
+import kr.co.vividnext.sodalive.content.LanguageDetectEvent
+import kr.co.vividnext.sodalive.content.LanguageDetectTargetType
 import kr.co.vividnext.sodalive.content.SortType
 import kr.co.vividnext.sodalive.content.series.ContentSeriesService
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationRepository
 import kr.co.vividnext.sodalive.explorer.follower.GetFollowerListResponse
 import kr.co.vividnext.sodalive.explorer.follower.GetFollowerListResponseItem
 import kr.co.vividnext.sodalive.explorer.profile.ChannelNotice
@@ -16,6 +19,7 @@ import kr.co.vividnext.sodalive.explorer.profile.PutWriteCheersRequest
 import kr.co.vividnext.sodalive.explorer.profile.creatorCommunity.CreatorCommunityService
 import kr.co.vividnext.sodalive.fcm.FcmEvent
 import kr.co.vividnext.sodalive.fcm.FcmEventType
+import kr.co.vividnext.sodalive.i18n.LangContext
 import kr.co.vividnext.sodalive.live.room.detail.GetRoomDetailUser
 import kr.co.vividnext.sodalive.member.Member
 import kr.co.vividnext.sodalive.member.MemberRole
@@ -44,6 +48,9 @@ class ExplorerService(
     private val seriesService: ContentSeriesService,
 
     private val applicationEventPublisher: ApplicationEventPublisher,
+    private val contentTranslationRepository: ContentTranslationRepository,
+
+    private val langContext: LangContext,
 
     @Value("\${cloud.aws.cloud-front.host}")
     private val cloudFrontHost: String
@@ -230,6 +237,24 @@ class ExplorerService(
             listOf()
         }
 
+        val contentIds = contentList.map { it.contentId }
+        val translatedContentList = if (contentIds.isNotEmpty()) {
+            val translations = contentTranslationRepository
+                .findByContentIdInAndLocale(contentIds = contentIds, locale = langContext.lang.code)
+                .associateBy { it.contentId }
+
+            contentList.map { item ->
+                val translatedTitle = translations[item.contentId]?.renderedPayload?.title
+                if (translatedTitle.isNullOrBlank()) {
+                    item
+                } else {
+                    item.copy(title = translatedTitle)
+                }
+            }
+        } else {
+            contentList
+        }
+
         // 크리에이터의 최신 오디오 콘텐츠 1개
         val latestContent = if (isCreator) {
             audioContentService.getLatestCreatorAudioContent(creatorId, member, isAdultContentVisible)
@@ -330,7 +355,7 @@ class ExplorerService(
             userDonationRanking = memberDonationRanking,
             similarCreatorList = similarCreatorList,
             liveRoomList = liveRoomList,
-            contentList = contentList,
+            contentList = translatedContentList,
             latestContent = latestContent,
             totalContentCount = totalContentCount,
             ownedContentCount = ownedContentCount,
@@ -441,7 +466,7 @@ class ExplorerService(
         val isBlocked = memberService.isBlocked(blockedMemberId = member.id!!, memberId = request.creatorId)
         if (isBlocked) throw SodaException("${creator.nickname}님의 요청으로 팬토크 작성이 제한됩니다.")
 
-        val cheers = CreatorCheers(cheers = request.content)
+        val cheers = CreatorCheers(cheers = request.content, languageCode = request.languageCode)
         cheers.member = member
         cheers.creator = creator
 
@@ -456,6 +481,17 @@ class ExplorerService(
         }
 
         cheersRepository.save(cheers)
+
+        // 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
+        if (request.languageCode.isNullOrBlank()) {
+            applicationEventPublisher.publishEvent(
+                LanguageDetectEvent(
+                    id = cheers.id!!,
+                    query = request.content,
+                    targetType = LanguageDetectTargetType.CREATOR_CHEERS
+                )
+            )
+        }
     }
 
     fun getCreatorProfileCheers(

src/main/kotlin/kr/co/vividnext/sodalive/explorer/GetCheersResponse.kt

@@ -11,6 +11,7 @@ data class GetCheersResponseItem(
     val nickname: String,
     val profileUrl: String,
     val content: String,
+    val languageCode: String?,
     val date: String,
     val replyList: List<GetCheersResponseItem>
 )

src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/CreatorCheers.kt

@@ -13,6 +13,7 @@ import javax.persistence.OneToMany
 data class CreatorCheers(
     @Column(columnDefinition = "TEXT", nullable = false)
     var cheers: String,
+    var languageCode: String?,
     var isActive: Boolean = true
 ) : BaseEntity() {
     @ManyToOne(fetch = FetchType.LAZY)

src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/PostWriteCheersRequest.kt

@@ -3,5 +3,6 @@ package kr.co.vividnext.sodalive.explorer.profile
 data class PostWriteCheersRequest(
     val parentId: Long? = null,
     val creatorId: Long,
-    val content: String
+    val content: String,
+    val languageCode: String? = null
 )

src/main/kotlin/kr/co/vividnext/sodalive/i18n/Lang.kt

@@ -0,0 +1,22 @@
+package kr.co.vividnext.sodalive.i18n
+
+import java.util.Locale
+
+enum class Lang(val code: String, val locale: Locale) {
+    KO("ko", Locale.KOREAN),
+    EN("en", Locale.ENGLISH),
+    JA("ja", Locale.JAPANESE);
+
+    companion object {
+        fun fromAcceptLanguage(header: String?): Lang {
+            if (header.isNullOrBlank()) return KO
+            val two = header.trim().lowercase().take(2) // 앱은 2자리만 보내지만 안전하게 처리
+            return when (two) {
+                "ko" -> KO
+                "en" -> EN
+                "ja" -> JA
+                else -> KO
+            }
+        }
+    }
+}

src/main/kotlin/kr/co/vividnext/sodalive/i18n/LangContext.kt

@@ -0,0 +1,15 @@
+package kr.co.vividnext.sodalive.i18n
+
+import org.springframework.stereotype.Component
+import org.springframework.web.context.annotation.RequestScope
+
+@Component
+@RequestScope
+class LangContext {
+    var lang: Lang = Lang.KO
+        internal set
+
+    fun setLang(lang: Lang) {
+        this.lang = lang
+    }
+}

src/main/kotlin/kr/co/vividnext/sodalive/i18n/LangInterceptor.kt

@@ -0,0 +1,21 @@
+package kr.co.vividnext.sodalive.i18n
+
+import org.springframework.stereotype.Component
+import org.springframework.web.servlet.HandlerInterceptor
+import javax.servlet.http.HttpServletRequest
+import javax.servlet.http.HttpServletResponse
+
+@Component
+class LangInterceptor(
+    private val langContext: LangContext
+) : HandlerInterceptor {
+    override fun preHandle(
+        request: HttpServletRequest,
+        response: HttpServletResponse,
+        handler: Any
+    ): Boolean {
+        val acceptLanguage = request.getHeader("Accept-Language")
+        langContext.setLang(Lang.fromAcceptLanguage(acceptLanguage))
+        return true
+    }
+}

src/main/kotlin/kr/co/vividnext/sodalive/i18n/translation/LanguageTranslationEvent.kt

@@ -0,0 +1,251 @@
+package kr.co.vividnext.sodalive.i18n.translation
+
+import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterRepository
+import kr.co.vividnext.sodalive.chat.character.translate.AiCharacterTranslation
+import kr.co.vividnext.sodalive.chat.character.translate.AiCharacterTranslationRenderedPayload
+import kr.co.vividnext.sodalive.chat.character.translate.AiCharacterTranslationRepository
+import kr.co.vividnext.sodalive.chat.character.translate.TranslatedAiCharacterBackground
+import kr.co.vividnext.sodalive.chat.character.translate.TranslatedAiCharacterPersonality
+import kr.co.vividnext.sodalive.content.AudioContentRepository
+import kr.co.vividnext.sodalive.content.theme.AudioContentThemeQueryRepository
+import kr.co.vividnext.sodalive.content.theme.translation.ContentThemeTranslation
+import kr.co.vividnext.sodalive.content.theme.translation.ContentThemeTranslationRepository
+import kr.co.vividnext.sodalive.content.translation.ContentTranslation
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationPayload
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationRepository
+import kr.co.vividnext.sodalive.i18n.translation.PapagoTranslationService.Companion.getTranslatableLanguageCodes
+import org.springframework.data.repository.findByIdOrNull
+import org.springframework.scheduling.annotation.Async
+import org.springframework.stereotype.Component
+import org.springframework.transaction.annotation.Propagation
+import org.springframework.transaction.annotation.Transactional
+import org.springframework.transaction.event.TransactionPhase
+import org.springframework.transaction.event.TransactionalEventListener
+
+enum class LanguageTranslationTargetType {
+    CONTENT,
+    CHARACTER,
+    CONTENT_THEME
+}
+
+class LanguageTranslationEvent(
+    val id: Long,
+    val targetType: LanguageTranslationTargetType
+)
+
+@Component
+class LanguageTranslationListener(
+    private val audioContentRepository: AudioContentRepository,
+    private val chatCharacterRepository: ChatCharacterRepository,
+    private val audioContentThemeRepository: AudioContentThemeQueryRepository,
+
+    private val contentTranslationRepository: ContentTranslationRepository,
+    private val aiCharacterTranslationRepository: AiCharacterTranslationRepository,
+    private val contentThemeTranslationRepository: ContentThemeTranslationRepository,
+
+    private val translationService: PapagoTranslationService
+) {
+    @Async
+    @TransactionalEventListener(phase = TransactionPhase.AFTER_COMMIT)
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    fun translation(event: LanguageTranslationEvent) {
+        when (event.targetType) {
+            LanguageTranslationTargetType.CONTENT -> handleContentLanguageTranslation(event)
+            LanguageTranslationTargetType.CHARACTER -> handleCharacterLanguageTranslation(event)
+            LanguageTranslationTargetType.CONTENT_THEME -> handleContentThemeLanguageTranslation(event)
+        }
+    }
+
+    private fun handleContentLanguageTranslation(event: LanguageTranslationEvent) {
+        val audioContent = audioContentRepository.findByIdOrNull(event.id) ?: return
+        val languageCode = audioContent.languageCode
+        if (languageCode != null) return
+
+        getTranslatableLanguageCodes(languageCode).forEach { locale ->
+            val tags = audioContent.audioContentHashTags
+                .mapNotNull { it.hashTag?.tag }
+                .joinToString(",")
+
+            val texts = mutableListOf<String>()
+            texts.add(audioContent.title)
+            texts.add(audioContent.detail)
+            texts.add(tags)
+
+            val sourceLanguage = audioContent.languageCode ?: "ko"
+
+            val response = translationService.translate(
+                request = TranslateRequest(
+                    texts = texts,
+                    sourceLanguage = sourceLanguage,
+                    targetLanguage = locale
+                )
+            )
+
+            val translatedTexts = response.translatedText
+            if (translatedTexts.size == texts.size) {
+                var index = 0
+
+                val translatedTitle = translatedTexts[index++]
+                val translatedDetail = translatedTexts[index++]
+                val translatedTags = translatedTexts[index]
+
+                val payload = ContentTranslationPayload(
+                    title = translatedTitle,
+                    detail = translatedDetail,
+                    tags = translatedTags
+                )
+
+                val existing = contentTranslationRepository
+                    .findByContentIdAndLocale(audioContent.id!!, locale)
+
+                if (existing == null) {
+                    contentTranslationRepository.save(
+                        ContentTranslation(
+                            contentId = audioContent.id!!,
+                            locale = locale,
+                            renderedPayload = payload
+                        )
+                    )
+                } else {
+                    existing.renderedPayload = payload
+                    contentTranslationRepository.save(existing)
+                }
+            }
+        }
+    }
+
+    private fun handleCharacterLanguageTranslation(event: LanguageTranslationEvent) {
+        val character = chatCharacterRepository.findByIdOrNull(event.id) ?: return
+        val languageCode = character.languageCode
+        if (languageCode != null) return
+
+        getTranslatableLanguageCodes(languageCode).forEach { locale ->
+            val personality = character.personalities.firstOrNull()
+            val background = character.backgrounds.firstOrNull()
+
+            val tags = character.tagMappings.joinToString(",") { it.tag.tag }
+
+            val texts = mutableListOf<String>()
+            texts.add(character.name)
+            texts.add(character.description)
+            texts.add(character.gender ?: "")
+
+            val hasPersonality = personality != null
+            if (hasPersonality) {
+                texts.add(personality!!.trait)
+                texts.add(personality.description)
+            }
+
+            val hasBackground = background != null
+            if (hasBackground) {
+                texts.add(background!!.topic)
+                texts.add(background.description)
+            }
+
+            texts.add(tags)
+
+            val sourceLanguage = character.languageCode ?: "ko"
+
+            val response = translationService.translate(
+                request = TranslateRequest(
+                    texts = texts,
+                    sourceLanguage = sourceLanguage,
+                    targetLanguage = locale
+                )
+            )
+
+            val translatedTexts = response.translatedText
+            if (translatedTexts.size == texts.size) {
+                var index = 0
+
+                val translatedName = translatedTexts[index++]
+                val translatedDescription = translatedTexts[index++]
+                val translatedGender = translatedTexts[index++]
+
+                var translatedPersonality: TranslatedAiCharacterPersonality? = null
+                if (hasPersonality) {
+                    translatedPersonality = TranslatedAiCharacterPersonality(
+                        trait = translatedTexts[index++],
+                        description = translatedTexts[index++]
+                    )
+                }
+
+                var translatedBackground: TranslatedAiCharacterBackground? = null
+                if (hasBackground) {
+                    translatedBackground = TranslatedAiCharacterBackground(
+                        topic = translatedTexts[index++],
+                        description = translatedTexts[index++]
+                    )
+                }
+
+                val translatedTags = translatedTexts[index]
+
+                val payload = AiCharacterTranslationRenderedPayload(
+                    name = translatedName,
+                    description = translatedDescription,
+                    gender = translatedGender,
+                    personalityTrait = translatedPersonality?.trait ?: "",
+                    personalityDescription = translatedPersonality?.description ?: "",
+                    backgroundTopic = translatedBackground?.topic ?: "",
+                    backgroundDescription = translatedBackground?.description ?: "",
+                    tags = translatedTags
+                )
+
+                val existing = aiCharacterTranslationRepository
+                    .findByCharacterIdAndLocale(character.id!!, locale)
+
+                if (existing == null) {
+                    val entity = AiCharacterTranslation(
+                        characterId = character.id!!,
+                        locale = locale,
+                        renderedPayload = payload
+                    )
+
+                    aiCharacterTranslationRepository.save(entity)
+                } else {
+                    existing.renderedPayload = payload
+                    aiCharacterTranslationRepository.save(existing)
+                }
+            }
+        }
+    }
+
+    private fun handleContentThemeLanguageTranslation(event: LanguageTranslationEvent) {
+        val contentTheme = audioContentThemeRepository.findThemeByIdAndActive(event.id) ?: return
+
+        val sourceLanguage = "ko"
+        getTranslatableLanguageCodes(sourceLanguage).forEach { locale ->
+            val texts = mutableListOf<String>()
+            texts.add(contentTheme.theme)
+
+            val response = translationService.translate(
+                request = TranslateRequest(
+                    texts = texts,
+                    sourceLanguage = sourceLanguage,
+                    targetLanguage = locale
+                )
+            )
+
+            val translatedTexts = response.translatedText
+            if (translatedTexts.size == texts.size) {
+                val translatedTheme = translatedTexts[0]
+
+                val existing = contentThemeTranslationRepository
+                    .findByContentThemeIdAndLocale(contentTheme.id!!, locale)
+
+                if (existing == null) {
+                    contentThemeTranslationRepository.save(
+                        ContentThemeTranslation(
+                            contentThemeId = contentTheme.id!!,
+                            locale = locale,
+                            theme = translatedTheme
+                        )
+                    )
+                } else {
+                    existing.theme = translatedTheme
+                    contentThemeTranslationRepository.save(existing)
+                }
+            }
+        }
+    }
+}

src/main/kotlin/kr/co/vividnext/sodalive/i18n/translation/PapagoTranslationResponse.kt

@@ -0,0 +1,40 @@
+package kr.co.vividnext.sodalive.i18n.translation
+
+/**
+ * Papago 번역 API 응답 예시
+ *
+ * ```json
+ * {
+ *   "message": {
+ *     "result": {
+ *       "srcLangType": "ko",
+ *       "tarLangType": "en",
+ *       "translatedText": "Hello, I like to eat apple while riding a bicycle."
+ *     }
+ *   }
+ * }
+ * ```
+ */
+
+/**
+ * 위 JSON 구조에 대응하는 최상위 응답 모델
+ */
+data class PapagoTranslationResponse(
+    val message: Message
+) {
+    /**
+     * message 필드 내부 구조
+     */
+    data class Message(
+        val result: Result
+    )
+
+    /**
+     * 실제 번역 결과 데이터
+     */
+    data class Result(
+        val srcLangType: String,
+        val tarLangType: String,
+        val translatedText: String
+    )
+}

src/main/kotlin/kr/co/vividnext/sodalive/i18n/translation/PapagoTranslationService.kt

@@ -0,0 +1,95 @@
+package kr.co.vividnext.sodalive.i18n.translation
+
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.http.HttpEntity
+import org.springframework.http.HttpHeaders
+import org.springframework.http.MediaType
+import org.springframework.stereotype.Service
+import org.springframework.web.client.RestTemplate
+
+@Service
+class PapagoTranslationService(
+    @Value("\${cloud.naver.papago-client-id}")
+    private val papagoClientId: String,
+
+    @Value("\${cloud.naver.papago-client-secret}")
+    private val papagoClientSecret: String
+) {
+    private val restTemplate: RestTemplate = RestTemplate()
+
+    private val papagoTranslateUrl = "https://papago.apigw.ntruss.com/nmt/v1/translation"
+
+    fun translate(request: TranslateRequest): TranslateResult {
+        if (request.texts.isEmpty() || request.sourceLanguage == request.targetLanguage) {
+            return TranslateResult(emptyList())
+        }
+
+        if (!validateLanguages(request.sourceLanguage, request.targetLanguage)) {
+            return TranslateResult(emptyList())
+        }
+
+        val headers = HttpHeaders().apply {
+            contentType = MediaType.APPLICATION_JSON
+            set("X-NCP-APIGW-API-KEY-ID", papagoClientId)
+            set("X-NCP-APIGW-API-KEY", papagoClientSecret)
+        }
+
+        val translatedTexts = mutableListOf<String>()
+
+        request.texts.forEach { text ->
+            try {
+                val body = mapOf(
+                    "source" to request.sourceLanguage,
+                    "target" to request.targetLanguage,
+                    "text" to text
+                )
+
+                val requestEntity = HttpEntity(body, headers)
+
+                val response = restTemplate.postForEntity(
+                    papagoTranslateUrl,
+                    requestEntity,
+                    PapagoTranslationResponse::class.java
+                )
+
+                if (!response.statusCode.is2xxSuccessful) {
+                    return@forEach
+                }
+
+                val translated = response.body?.message?.result?.translatedText
+                translatedTexts.add(translated ?: "")
+            } catch (_: Exception) {
+            }
+        }
+
+        return TranslateResult(translatedTexts)
+    }
+
+    private fun validateLanguages(sourceLanguage: String, targetLanguage: String): Boolean {
+        return requireSupportedLanguage(sourceLanguage) && requireSupportedLanguage(targetLanguage)
+    }
+
+    private fun requireSupportedLanguage(language: String): Boolean {
+        val normalized = language.lowercase()
+        return SUPPORTED_LANGUAGE_CODES.contains(normalized)
+    }
+
+    companion object {
+        private val SUPPORTED_LANGUAGE_CODES = setOf(
+            "ko",
+            "en",
+            "ja"
+        )
+
+        /**
+         * 번역 대상 언어 코드 집합을 반환한다.
+         *
+         * @param excludedLanguageCode 번역 대상에서 제외할 언어 코드(대소문자 무시)
+         * @return 지원되는 언어 코드 중 [excludedLanguageCode]를 제외한 집합
+         */
+        fun getTranslatableLanguageCodes(excludedLanguageCode: String?): Set<String> {
+            val normalized = excludedLanguageCode?.lowercase()
+            return SUPPORTED_LANGUAGE_CODES.filterNot { it == normalized }.toSet()
+        }
+    }
+}

src/main/kotlin/kr/co/vividnext/sodalive/i18n/translation/TranslateRequest.kt

@@ -0,0 +1,11 @@
+package kr.co.vividnext.sodalive.i18n.translation
+
+data class TranslateRequest(
+    val texts: List<String>,
+    val sourceLanguage: String,
+    val targetLanguage: String
+)
+
+data class TranslateResult(
+    val translatedText: List<String>
+)

src/main/resources/application.yml

@@ -45,6 +45,9 @@ google:
     webClientId: ${GOOGLE_WEB_CLIENT_ID}
 
 cloud:
+    naver:
+        papagoClientId: ${NCLOUD_PAPAGO_CLIENT_ID}
+        papagoClientSecret: ${NCLOUD_PAPAGO_CLIENT_SECRET}
     aws:
         credentials:
             accessKey: ${APP_AWS_ACCESS_KEY}

work/scripts/check-commit-message-rules.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+
+# Check if a commit message follows project rules
+# Rules: 50/72 formatting, no advertisements/branding
+# Usage: ./check-commit-message-rules.sh [commit-hash]
+# If no commit-hash is provided, checks the latest commit
+
+# Determine which commit to check
+if [ $# -eq 0 ]; then
+    commit_ref="HEAD"
+    echo "Checking latest commit..."
+else
+    commit_ref="$1"
+    echo "Checking commit: $commit_ref"
+fi
+
+# Get the commit message
+commit_message=$(git log -1 --pretty=format:"%s%n%b" "$commit_ref")
+
+# Split into subject and body
+subject=$(echo "$commit_message" | head -n1)
+body=$(echo "$commit_message" | tail -n +2 | sed '/^$/d')
+
+echo "Checking commit message format..."
+echo "Subject: $subject"
+
+# Check subject line length
+subject_length=${#subject}
+if [ $subject_length -gt 50 ]; then
+    echo "[FAIL] Subject line too long: $subject_length characters (max 50)"
+    exit_code=1
+else
+    echo "[PASS] Subject line length OK: $subject_length characters"
+    exit_code=0
+fi
+
+# Check body line lengths if body exists
+if [ -n "$body" ]; then
+    echo "Checking body line lengths..."
+    while IFS= read -r line; do
+        line_length=${#line}
+        if [ $line_length -gt 72 ]; then
+            echo "[FAIL] Body line too long: $line_length characters (max 72)"
+            echo "Line: $line"
+            exit_code=1
+        fi
+    done <<< "$body"
+
+    if [ $exit_code -eq 0 ]; then
+        echo "[PASS] All body lines within 72 characters"
+    fi
+else
+    echo "[INFO] No body content to check"
+fi
+
+# Check for advertisements, branding, or promotional content
+echo "Checking for advertisements and branding..."
+if echo "$commit_message" | grep -qi "generated with\|claude code\|anthropic\|co-authored-by.*claude\|🤖"; then
+    echo "[FAIL] Commit message contains advertisements, branding, or promotional content"
+    exit_code=1
+else
+    echo "[PASS] No advertisements or branding detected"
+fi
+
+if [ $exit_code -eq 0 ]; then
+    echo "[PASS] Commit message follows all rules"
+else
+    echo "[FAIL] Commit message violates project rules"
+fi
+
+exit $exit_code