diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/chat/character/controller/ChatCharacterController.kt b/src/main/kotlin/kr/co/vividnext/sodalive/chat/character/controller/ChatCharacterController.kt
index 68a292f..63ae72b 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/chat/character/controller/ChatCharacterController.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/chat/character/controller/ChatCharacterController.kt
@@ -23,6 +23,7 @@ import kr.co.vividnext.sodalive.chat.character.translate.TranslatedAiCharacterPe
 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
@@ -34,7 +35,6 @@ import org.springframework.web.bind.annotation.PathVariable
 import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RequestParam
 import org.springframework.web.bind.annotation.RestController
-import kotlin.collections.map
 
 @RestController
 @RequestMapping("/api/chat/character")
@@ -48,12 +48,13 @@ class ChatCharacterController(
     private val translationService: PapagoTranslationService,
     private val aiCharacterTranslationRepository: AiCharacterTranslationRepository,
 
+    private val langContext: LangContext,
+
     @Value("\${cloud.aws.cloud-front.host}")
     private val imageHost: String
 ) {
     @GetMapping("/main")
     fun getCharacterMain(
-        @RequestParam(required = false) languageCode: String? = null,
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?
     ): ApiResponse<CharacterMainResponse> = run {
         // 배너 조회 (최대 10개)
@@ -80,32 +81,19 @@ class ChatCharacterController(
                 }
         }
 
-        /**
-         * 최근 대화한 캐릭터 이름 번역 데이터 조회
-         *
-         * languageCode != null
-         * aiCharacterTranslationRepository 이용해 번역 콘텐츠를 조회한다. - characterId, locale
-         *
-         * 한 번에 조회하고 characterId 매핑하여 recentCharacters 캐릭터 이름을 번역 데이터로 변경한다
-         */
-        val translatedRecentCharacters = if (!languageCode.isNullOrBlank()) {
-            val characterIds = recentCharacters.map { it.characterId }
+        val characterIds = recentCharacters.map { it.characterId }
+        val translatedRecentCharacters = if (characterIds.isNotEmpty()) {
+            val translations = aiCharacterTranslationRepository
+                .findByCharacterIdInAndLocale(characterIds = characterIds, locale = langContext.lang.code)
+                .associateBy { it.characterId }
 
-            if (characterIds.isNotEmpty()) {
-                val translations = aiCharacterTranslationRepository
-                    .findByCharacterIdInAndLocale(characterIds = characterIds, locale = languageCode)
-                    .associateBy { it.characterId }
-
-                recentCharacters.map { character ->
-                    val translatedName = translations[character.characterId]?.renderedPayload?.name
-                    if (translatedName.isNullOrBlank()) {
-                        character
-                    } else {
-                        character.copy(name = translatedName)
-                    }
+            recentCharacters.map { character ->
+                val translatedName = translations[character.characterId]?.renderedPayload?.name
+                if (translatedName.isNullOrBlank()) {
+                    character
+                } else {
+                    character.copy(name = translatedName)
                 }
-            } else {
-                recentCharacters
             }
         } else {
             recentCharacters
@@ -114,76 +102,12 @@ class ChatCharacterController(
         // 인기 캐릭터 조회
         val popularCharacters = service.getPopularCharacters()
 
-        /**
-         * popularCharacters 캐릭터 이름과 description 번역 데이터 조회
-         *
-         * languageCode != null
-         * aiCharacterTranslationRepository 이용해 번역 콘텐츠를 조회한다. - characterId, locale
-         *
-         * 한 번에 조회하고 characterId 매핑하여 popularCharacters의 캐릭터 이름과 description을 번역 데이터로 변경한다
-         */
-        val translatedPopularCharacters = if (!languageCode.isNullOrBlank()) {
-            val characterIds = popularCharacters.map { it.characterId }
-
-            if (characterIds.isNotEmpty()) {
-                val translations = aiCharacterTranslationRepository
-                    .findByCharacterIdInAndLocale(characterIds = characterIds, locale = languageCode)
-                    .associateBy { it.characterId }
-
-                popularCharacters.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 {
-                popularCharacters
-            }
-        } else {
-            popularCharacters
-        }
-
         // 최근 등록된 캐릭터 리스트 조회
         val newCharacters = service.getRecentCharactersPage(
             page = 0,
             size = 50
         ).content
 
-        /**
-         * 최근 등록된 캐릭터 이름 번역 데이터 조회
-         *
-         * languageCode != null
-         * aiCharacterTranslationRepository 이용해 번역 콘텐츠를 조회한다. - characterId, locale
-         *
-         * 한 번에 조회하고 characterId 매핑하여 newCharacters 캐릭터 이름과 description을 번역 데이터로 변경한다
-         */
-        val translatedNewCharacters = if (!languageCode.isNullOrBlank()) {
-            val characterIds = newCharacters.map { it.characterId }
-
-            if (characterIds.isNotEmpty()) {
-                val translations = aiCharacterTranslationRepository
-                    .findByCharacterIdInAndLocale(characterIds = characterIds, locale = languageCode)
-                    .associateBy { it.characterId }
-
-                newCharacters.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 {
-                newCharacters
-            }
-        } else {
-            newCharacters
-        }
-
         // 추천 캐릭터 조회
         // 최근 대화한 캐릭터를 제외한 랜덤 30개 조회
         // Controller에서는 호출만
@@ -191,38 +115,6 @@ class ChatCharacterController(
         val excludeIds = recentCharacters.map { it.characterId }
         val recommendCharacters = service.getRecommendCharacters(excludeIds, 30)
 
-        /**
-         * 추천 캐릭터 이름 번역 데이터 조회
-         *
-         * languageCode != null
-         * aiCharacterTranslationRepository 이용해 번역 콘텐츠를 조회한다. - characterId, locale
-         *
-         * 한 번에 조회하고 characterId 매핑하여 recommendCharacters 캐릭터 이름과 description을 번역 데이터로 변경한다
-         */
-        val translatedRecommendCharacters = if (!languageCode.isNullOrBlank()) {
-            val characterIds = recommendCharacters.map { it.characterId }
-
-            if (characterIds.isNotEmpty()) {
-                val translations = aiCharacterTranslationRepository
-                    .findByCharacterIdInAndLocale(characterIds = characterIds, locale = languageCode)
-                    .associateBy { it.characterId }
-
-                recommendCharacters.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 {
-                recommendCharacters
-            }
-        } else {
-            recommendCharacters
-        }
-
         // 큐레이션 섹션 (활성화된 큐레이션 + 캐릭터)
         val curationSections = curationQueryService.getActiveCurationsWithCharacters()
             .map { agg ->
@@ -246,9 +138,9 @@ class ChatCharacterController(
             CharacterMainResponse(
                 banners = banners,
                 recentCharacters = translatedRecentCharacters,
-                popularCharacters = translatedPopularCharacters,
-                newCharacters = translatedNewCharacters,
-                recommendCharacters = translatedRecommendCharacters,
+                popularCharacters = getTranslatedAiCharacterList(popularCharacters),
+                newCharacters = getTranslatedAiCharacterList(newCharacters),
+                recommendCharacters = getTranslatedAiCharacterList(recommendCharacters),
                 curationSections = curationSections
             )
         )
@@ -261,7 +153,6 @@ class ChatCharacterController(
     @GetMapping("/{characterId}")
     fun getCharacterDetail(
         @PathVariable characterId: Long,
-        @RequestParam(required = false, defaultValue = "ko") languageCode: String? = "ko",
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?
     ) = run {
         if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
@@ -292,11 +183,9 @@ class ChatCharacterController(
         }
 
         var translated: TranslatedAiCharacterDetail? = null
-        if (!languageCode.isNullOrBlank() && languageCode != character.languageCode) {
-            val locale = languageCode.lowercase()
-
+        if (langContext.lang.code != character.languageCode) {
             val existing = aiCharacterTranslationRepository
-                .findByCharacterIdAndLocale(character.id!!, locale)
+                .findByCharacterIdAndLocale(character.id!!, langContext.lang.code)
 
             if (existing != null) {
                 val payload = existing.renderedPayload
@@ -344,7 +233,7 @@ class ChatCharacterController(
                     request = TranslateRequest(
                         texts = texts,
                         sourceLanguage = sourceLanguage,
-                        targetLanguage = locale
+                        targetLanguage = langContext.lang.code
                     )
                 )
 
@@ -387,7 +276,7 @@ class ChatCharacterController(
 
                     val entity = AiCharacterTranslation(
                         characterId = character.id!!,
-                        locale = locale,
+                        locale = langContext.lang.code,
                         renderedPayload = payload
                     )
 
@@ -427,27 +316,22 @@ class ChatCharacterController(
          *
          * 한 번에 조회하고 characterId 매핑하여 others 캐릭터 이름과 tags 번역 데이터로 변경한다
          */
-        val translatedOthers = if (!languageCode.isNullOrBlank()) {
-            val characterIds = others.map { it.characterId }
+        val characterIds = others.map { it.characterId }
+        val translatedOthers = if (characterIds.isNotEmpty()) {
+            val translations = aiCharacterTranslationRepository
+                .findByCharacterIdInAndLocale(characterIds = characterIds, locale = langContext.lang.code)
+                .associateBy { it.characterId }
 
-            if (characterIds.isNotEmpty()) {
-                val translations = aiCharacterTranslationRepository
-                    .findByCharacterIdInAndLocale(characterIds = characterIds, locale = languageCode)
-                    .associateBy { it.characterId }
+            others.map { other ->
+                val payload = translations[other.characterId]?.renderedPayload
+                val translatedName = payload?.name
+                val translatedTags = payload?.tags
 
-                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)
-                    }
+                if (translatedName.isNullOrBlank() || translatedTags.isNullOrBlank()) {
+                    other
+                } else {
+                    other.copy(name = translatedName, tags = translatedTags)
                 }
-            } else {
-                others
             }
         } else {
             others
@@ -488,7 +372,6 @@ class ChatCharacterController(
      */
     @GetMapping("/recent")
     fun getRecentCharacters(
-        @RequestParam(required = false) languageCode: String? = null,
         @RequestParam("page", required = false) page: Int?
     ): ApiResponse<RecentCharactersResponse> = run {
         val characterPage = service.getRecentCharactersPage(
@@ -496,41 +379,9 @@ class ChatCharacterController(
             size = 20
         )
 
-        /**
-         * 최근 등록된 캐릭터 이름 번역 데이터 조회
-         *
-         * languageCode != null
-         * aiCharacterTranslationRepository 이용해 번역 콘텐츠를 조회한다. - characterId, locale
-         *
-         * 한 번에 조회하고 characterId 매핑하여 characterList 캐릭터 이름과 description을 번역 데이터로 변경한다
-         */
-        val translatedContent = if (!languageCode.isNullOrBlank()) {
-            val characterIds = characterPage.content.map { it.characterId }
-
-            if (characterIds.isNotEmpty()) {
-                val translations = aiCharacterTranslationRepository
-                    .findByCharacterIdInAndLocale(characterIds = characterIds, locale = languageCode)
-                    .associateBy { it.characterId }
-
-                characterPage.content.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 {
-                characterPage.content
-            }
-        } else {
-            characterPage.content
-        }
-
         val translatedCharacterPage = RecentCharactersResponse(
             totalCount = characterPage.totalCount,
-            content = translatedContent
+            content = getTranslatedAiCharacterList(characterPage.content)
         )
 
         ApiResponse.ok(translatedCharacterPage)
@@ -543,7 +394,6 @@ class ChatCharacterController(
      */
     @GetMapping("/recommend")
     fun getRecommendCharacters(
-        @RequestParam(required = false) languageCode: String? = null,
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?
     ) = run {
         val recent = if (member == null || member.auth == null) {
@@ -553,40 +403,48 @@ class ChatCharacterController(
                 .listMyChatRooms(member, 0, 50) // 최근 기록은 최대 50개까지만 제외 대상으로 고려
                 .map { it.characterId }
         }
-        val characterList = service.getRecommendCharacters(recent, 20)
 
-        /**
-         * 추천 캐릭터 이름 번역 데이터 조회
-         *
-         * languageCode != null
-         * aiCharacterTranslationRepository 이용해 번역 콘텐츠를 조회한다. - characterId, locale
-         *
-         * 한 번에 조회하고 characterId 매핑하여 characterList 캐릭터 이름과 description을 번역 데이터로 변경한다
-         */
-        val translatedCharacterList = if (!languageCode.isNullOrBlank()) {
-            val characterIds = characterList.map { it.characterId }
+        ApiResponse.ok(
+            getTranslatedAiCharacterList(
+                service.getRecommendCharacters(
+                    recent,
+                    20
+                )
+            )
+        )
+    }
 
-            if (characterIds.isNotEmpty()) {
-                val translations = aiCharacterTranslationRepository
-                    .findByCharacterIdInAndLocale(characterIds = characterIds, locale = languageCode)
-                    .associateBy { it.characterId }
+    /**
+     * 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 }
 
-                characterList.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)
-                    }
+        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 {
-                characterList
             }
         } else {
-            characterList
+            aiCharacterList
         }
-
-        ApiResponse.ok(translatedCharacterList)
     }
 }