diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/can/payment/CanPaymentService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/can/payment/CanPaymentService.kt
index ce57b14..b34f886 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/can/payment/CanPaymentService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/can/payment/CanPaymentService.kt
@@ -38,6 +38,8 @@ class CanPaymentService(
         memberId: Long,
         needCan: Int,
         canUsage: CanUsage,
+        chatRoomId: Long? = null,
+        characterId: Long? = null,
         isSecret: Boolean = false,
         liveRoom: LiveRoom? = null,
         order: Order? = null,
@@ -110,12 +112,14 @@ class CanPaymentService(
             recipientId = liveRoom.member!!.id!!
             useCan.room = liveRoom
             useCan.member = member
-        } else if (canUsage == CanUsage.CHAT_QUOTA_PURCHASE) {
-            // 채팅 쿼터 구매는 수신자 개념 없이 본인에게 귀속
+        } else if (canUsage == CanUsage.CHAT_QUOTA_PURCHASE && chatRoomId != null && characterId != null) {
             useCan.member = member
+            useCan.chatRoomId = chatRoomId
+            useCan.characterId = characterId
         } else if (canUsage == CanUsage.CHAT_ROOM_RESET) {
-            // 채팅방 초기화 결제: 별도 구분. 수신자 없이 본인 귀속
             useCan.member = member
+            useCan.chatRoomId = chatRoomId
+            useCan.characterId = characterId
         } else {
             throw SodaException("잘못된 요청입니다.")
         }
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/can/use/UseCan.kt b/src/main/kotlin/kr/co/vividnext/sodalive/can/use/UseCan.kt
index 3d0fc46..dfb0b2b 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/can/use/UseCan.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/can/use/UseCan.kt
@@ -30,7 +30,11 @@ data class UseCan(
 
     var isRefund: Boolean = false,
 
-    val isSecret: Boolean = false
+    val isSecret: Boolean = false,
+
+    // 채팅 연동을 위한 식별자 (옵션)
+    var chatRoomId: Long? = null,
+    var characterId: Long? = null
 ) : BaseEntity() {
     @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "member_id", nullable = false)
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/ChatQuotaController.kt b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/ChatQuotaController.kt
index fa0640e..c82a281 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/ChatQuotaController.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/ChatQuotaController.kt
@@ -1,5 +1,6 @@
 package kr.co.vividnext.sodalive.chat.quota
 
+import kr.co.vividnext.sodalive.can.payment.CanPaymentService
 import kr.co.vividnext.sodalive.can.use.CanUsage
 import kr.co.vividnext.sodalive.common.ApiResponse
 import kr.co.vividnext.sodalive.common.SodaException
@@ -15,7 +16,7 @@ import org.springframework.web.bind.annotation.RestController
 @RequestMapping("/api/chat/quota")
 class ChatQuotaController(
     private val chatQuotaService: ChatQuotaService,
-    private val canPaymentService: kr.co.vividnext.sodalive.can.payment.CanPaymentService
+    private val canPaymentService: CanPaymentService
 ) {
 
     data class ChatQuotaStatusResponse(
@@ -55,10 +56,7 @@ class ChatQuotaController(
             container = request.container
         )
 
-        // 유료 횟수 적립 (기본 40)
-        val add = 40
-        chatQuotaService.purchase(member.id!!, add)
-
+        // 글로벌 유료 개념 제거됨: 구매 성공 시에도 글로벌 쿼터 증액 없음
         val s = chatQuotaService.getStatus(member.id!!)
         ApiResponse.ok(ChatQuotaStatusResponse(s.totalRemaining, s.nextRechargeAtEpochMillis))
     }
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/ChatQuotaService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/ChatQuotaService.kt
index d62c822..b3685ec 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/ChatQuotaService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/ChatQuotaService.kt
@@ -1,18 +1,18 @@
 package kr.co.vividnext.sodalive.chat.quota
 
-import kr.co.vividnext.sodalive.common.SodaException
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
+import java.time.Instant
 import java.time.LocalDateTime
 import java.time.ZoneId
+import java.time.ZoneOffset
 
 @Service
 class ChatQuotaService(
     private val repo: ChatQuotaRepository
 ) {
     companion object {
-        private const val FREE_BUCKET = 10
-        private const val RECHARGE_HOURS = 1L
+        private const val FREE_BUCKET = 40
     }
 
     data class QuotaStatus(
@@ -20,63 +20,43 @@ class ChatQuotaService(
         val nextRechargeAtEpochMillis: Long?
     )
 
-    @Transactional
-    fun applyRefillOnEnterAndGetStatus(memberId: Long): QuotaStatus {
-        val now = LocalDateTime.now()
-        val quota = repo.findForUpdate(memberId) ?: repo.save(ChatQuota(memberId = memberId))
-        if (quota.remainingFree == 0 && quota.nextRechargeAt != null && !now.isBefore(quota.nextRechargeAt)) {
-            quota.remainingFree = FREE_BUCKET
-            quota.nextRechargeAt = null
-        }
-        val epoch = quota.nextRechargeAt?.atZone(ZoneId.systemDefault())?.toInstant()?.toEpochMilli()
-        return QuotaStatus(totalRemaining = quota.total(), nextRechargeAtEpochMillis = epoch)
+    private fun nextUtc20LocalDateTime(now: Instant = Instant.now()): LocalDateTime {
+        val nowUtc = LocalDateTime.ofInstant(now, ZoneOffset.UTC)
+        val today20 = nowUtc.withHour(20).withMinute(0).withSecond(0).withNano(0)
+        val target = if (nowUtc.isBefore(today20)) today20 else today20.plusDays(1)
+        // 저장은 시스템 기본 타임존의 LocalDateTime으로 보관
+        return LocalDateTime.ofInstant(target.toInstant(ZoneOffset.UTC), ZoneId.systemDefault())
     }
 
     @Transactional
-    fun consumeOne(memberId: Long) {
-        val now = LocalDateTime.now()
+    fun applyRefillOnEnterAndGetStatus(memberId: Long): QuotaStatus {
+        val now = Instant.now()
         val quota = repo.findForUpdate(memberId) ?: repo.save(ChatQuota(memberId = memberId))
-
-        when {
-            quota.remainingFree > 0 -> {
-                quota.remainingFree -= 1
-                if (quota.remainingFree + quota.remainingPaid == 0 && quota.nextRechargeAt == null) {
-                    quota.nextRechargeAt = now.plusMinutes(RECHARGE_HOURS)
-                }
-            }
-
-            quota.remainingPaid > 0 -> {
-                quota.remainingPaid -= 1
-                if (quota.remainingFree + quota.remainingPaid == 0 && quota.nextRechargeAt == null) {
-                    quota.nextRechargeAt = now.plusMinutes(RECHARGE_HOURS)
-                }
-            }
-
-            else -> {
-                if (quota.nextRechargeAt == null) {
-                    quota.nextRechargeAt = now.plusMinutes(RECHARGE_HOURS)
-                }
-                throw SodaException("채팅 가능 횟수가 모두 소진되었습니다. 다음 무료 충전 이후 이용해주세요.")
-            }
+        // Lazy refill: nextRechargeAt이 없거나 현재를 지났다면 무료 40 회복
+        val nextRecharge = nextUtc20LocalDateTime(now)
+        if (quota.nextRechargeAt == null || !LocalDateTime.now().isBefore(quota.nextRechargeAt)) {
+            quota.remainingFree = FREE_BUCKET
         }
+        // 다음 UTC20 기준 시간으로 항상 갱신
+        quota.nextRechargeAt = nextRecharge
+
+        val epoch = quota.nextRechargeAt?.atZone(ZoneId.systemDefault())?.toInstant()?.toEpochMilli()
+        // 글로벌은 유료 개념 제거: totalRemaining은 remainingFree만 사용
+        return QuotaStatus(totalRemaining = quota.remainingFree, nextRechargeAtEpochMillis = epoch)
+    }
+
+    @Transactional
+    fun consumeOneFree(memberId: Long) {
+        val quota = repo.findForUpdate(memberId) ?: repo.save(ChatQuota(memberId = memberId))
+        if (quota.remainingFree <= 0) {
+            // 소비 불가: 호출자는 상태 조회로 남은 시간을 판단
+            throw IllegalStateException("No global free quota")
+        }
+        quota.remainingFree -= 1
     }
 
     @Transactional
     fun getStatus(memberId: Long): QuotaStatus {
         return applyRefillOnEnterAndGetStatus(memberId)
     }
-
-    @Transactional
-    fun purchase(memberId: Long, addPaid: Int) {
-        val quota = repo.findForUpdate(memberId) ?: repo.save(ChatQuota(memberId = memberId))
-        quota.remainingPaid += addPaid
-        quota.nextRechargeAt = null
-    }
-
-    @Transactional
-    fun resetFreeToDefault(memberId: Long) {
-        val quota = repo.findForUpdate(memberId) ?: repo.save(ChatQuota(memberId = memberId))
-        quota.remainingFree = FREE_BUCKET
-        quota.nextRechargeAt = null
-    }
 }
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuota.kt b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuota.kt
new file mode 100644
index 0000000..ec5687e
--- /dev/null
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuota.kt
@@ -0,0 +1,19 @@
+package kr.co.vividnext.sodalive.chat.quota.room
+
+import kr.co.vividnext.sodalive.common.BaseEntity
+import javax.persistence.Entity
+import javax.persistence.Table
+import javax.persistence.Version
+
+@Entity
+@Table(name = "chat_room_quota")
+class ChatRoomQuota(
+    val memberId: Long,
+    val chatRoomId: Long,
+    val characterId: Long,
+    var remainingFree: Int = 10,
+    var remainingPaid: Int = 0,
+    var nextRechargeAt: Long? = null,
+    @Version
+    var version: Long? = null
+) : BaseEntity()
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaController.kt b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaController.kt
new file mode 100644
index 0000000..3064bc1
--- /dev/null
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaController.kt
@@ -0,0 +1,139 @@
+package kr.co.vividnext.sodalive.chat.quota.room
+
+import kr.co.vividnext.sodalive.chat.quota.ChatQuotaService
+import kr.co.vividnext.sodalive.chat.room.ParticipantType
+import kr.co.vividnext.sodalive.chat.room.repository.ChatParticipantRepository
+import kr.co.vividnext.sodalive.chat.room.repository.ChatRoomRepository
+import kr.co.vividnext.sodalive.common.ApiResponse
+import kr.co.vividnext.sodalive.common.SodaException
+import kr.co.vividnext.sodalive.member.Member
+import org.springframework.security.core.annotation.AuthenticationPrincipal
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@RequestMapping("/api/chat/rooms")
+class ChatRoomQuotaController(
+    private val chatRoomRepository: ChatRoomRepository,
+    private val participantRepository: ChatParticipantRepository,
+    private val chatRoomQuotaService: ChatRoomQuotaService,
+    private val chatQuotaService: ChatQuotaService
+) {
+
+    data class PurchaseRoomQuotaRequest(
+        val container: String
+    )
+
+    data class PurchaseRoomQuotaResponse(
+        val totalRemaining: Int,
+        val nextRechargeAtEpoch: Long?,
+        val remainingFree: Int,
+        val remainingPaid: Int
+    )
+
+    data class RoomQuotaStatusResponse(
+        val totalRemaining: Int,
+        val nextRechargeAtEpoch: Long?
+    )
+
+    /**
+     * 채팅방 유료 쿼터 구매 API
+     * - 참여 여부 검증(내가 USER로 참여 중인 활성 방)
+     * - 30캔 결제 (UseCan에 chatRoomId:characterId 기록)
+     * - 방 유료 쿼터 40 충전
+     */
+    @PostMapping("/{chatRoomId}/quota/purchase")
+    fun purchaseRoomQuota(
+        @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?,
+        @PathVariable chatRoomId: Long,
+        @RequestBody req: PurchaseRoomQuotaRequest
+    ): ApiResponse<PurchaseRoomQuotaResponse> = run {
+        if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
+        if (member.auth == null) throw SodaException("본인인증을 하셔야 합니다.")
+        if (req.container.isBlank()) throw SodaException("container를 확인해주세요.")
+
+        val room = chatRoomRepository.findByIdAndIsActiveTrue(chatRoomId)
+            ?: throw SodaException("채팅방을 찾을 수 없습니다.")
+
+        // 내 참여 여부 확인
+        participantRepository.findByChatRoomAndMemberAndIsActiveTrue(room, member)
+            ?: throw SodaException("잘못된 접근입니다")
+
+        // 캐릭터 참여자 확인(유효한 AI 캐릭터 방인지 체크 및 characterId 기본값 보조)
+        val characterParticipant = participantRepository
+            .findByChatRoomAndParticipantTypeAndIsActiveTrue(room, ParticipantType.CHARACTER)
+            ?: throw SodaException("AI 캐릭터 채팅방이 아닙니다.")
+
+        val character = characterParticipant.character
+            ?: throw SodaException("AI 캐릭터 채팅방이 아닙니다.")
+
+        val characterId = character.id
+            ?: throw SodaException("잘못된 요청입니다. 캐릭터 정보를 확인해주세요.")
+
+        // 서비스에서 결제 포함하여 처리
+        val status = chatRoomQuotaService.purchase(
+            memberId = member.id!!,
+            chatRoomId = chatRoomId,
+            characterId = characterId,
+            addPaid = 40,
+            container = req.container
+        )
+
+        ApiResponse.ok(
+            PurchaseRoomQuotaResponse(
+                totalRemaining = status.totalRemaining,
+                nextRechargeAtEpoch = status.nextRechargeAtEpochMillis,
+                remainingFree = status.remainingFree,
+                remainingPaid = status.remainingPaid
+            )
+        )
+    }
+
+    @GetMapping("/{chatRoomId}/quota/me")
+    fun getMyRoomQuota(
+        @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?,
+        @PathVariable chatRoomId: Long
+    ): ApiResponse<RoomQuotaStatusResponse> = run {
+        if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
+        if (member.auth == null) throw SodaException("본인인증을 하셔야 합니다.")
+
+        val room = chatRoomRepository.findByIdAndIsActiveTrue(chatRoomId)
+            ?: throw SodaException("채팅방을 찾을 수 없습니다.")
+        // 내 참여 여부 확인
+        participantRepository.findByChatRoomAndMemberAndIsActiveTrue(room, member)
+            ?: throw SodaException("잘못된 접근입니다")
+        // 캐릭터 확인
+        val characterParticipant = participantRepository
+            .findByChatRoomAndParticipantTypeAndIsActiveTrue(room, ParticipantType.CHARACTER)
+            ?: throw SodaException("AI 캐릭터 채팅방이 아닙니다.")
+        val character = characterParticipant.character
+            ?: throw SodaException("AI 캐릭터 채팅방이 아닙니다.")
+
+        // 글로벌 Lazy refill
+        val globalStatus = chatQuotaService.getStatus(member.id!!)
+
+        // 룸 Lazy refill 상태
+        val roomStatus = chatRoomQuotaService.applyRefillOnEnterAndGetStatus(
+            memberId = member.id!!,
+            chatRoomId = chatRoomId,
+            characterId = character.id!!,
+            globalFree = globalStatus.totalRemaining
+        )
+
+        val next: Long? = when {
+            roomStatus.totalRemaining == 0 -> roomStatus.nextRechargeAtEpochMillis
+            globalStatus.totalRemaining <= 0 -> globalStatus.nextRechargeAtEpochMillis
+            else -> null
+        }
+        ApiResponse.ok(
+            RoomQuotaStatusResponse(
+                totalRemaining = roomStatus.totalRemaining,
+                nextRechargeAtEpoch = next
+            )
+        )
+    }
+}
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaRepository.kt b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaRepository.kt
new file mode 100644
index 0000000..962d8a2
--- /dev/null
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaRepository.kt
@@ -0,0 +1,16 @@
+package kr.co.vividnext.sodalive.chat.quota.room
+
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.data.jpa.repository.Lock
+import org.springframework.data.jpa.repository.Query
+import org.springframework.data.repository.query.Param
+import javax.persistence.LockModeType
+
+interface ChatRoomQuotaRepository : JpaRepository<ChatRoomQuota, Long> {
+    @Lock(LockModeType.PESSIMISTIC_WRITE)
+    @Query("select q from ChatRoomQuota q where q.memberId = :memberId and q.chatRoomId = :chatRoomId")
+    fun findForUpdate(
+        @Param("memberId") memberId: Long,
+        @Param("chatRoomId") chatRoomId: Long
+    ): ChatRoomQuota?
+}
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaService.kt
new file mode 100644
index 0000000..db24ea6
--- /dev/null
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/chat/quota/room/ChatRoomQuotaService.kt
@@ -0,0 +1,172 @@
+package kr.co.vividnext.sodalive.chat.quota.room
+
+import kr.co.vividnext.sodalive.can.payment.CanPaymentService
+import kr.co.vividnext.sodalive.can.use.CanUsage
+import kr.co.vividnext.sodalive.common.SodaException
+import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Transactional
+import java.time.Duration
+import java.time.Instant
+
+@Service
+class ChatRoomQuotaService(
+    private val repo: ChatRoomQuotaRepository,
+    private val canPaymentService: CanPaymentService
+) {
+    data class RoomQuotaStatus(
+        val totalRemaining: Int,
+        val nextRechargeAtEpochMillis: Long?,
+        val remainingFree: Int,
+        val remainingPaid: Int
+    )
+
+    private fun calculateAvailableForRoom(globalFree: Int, roomFree: Int, roomPaid: Int): Int {
+        // 유료가 있으면 글로벌 상관 없이 (유료 + 무료동시가능수)로 계산
+        // 무료만 있는 경우에는 글로벌과 룸 Free의 교집합으로 사용 가능 횟수 계산
+        val freeUsable = minOf(globalFree, roomFree)
+        return roomPaid + freeUsable
+    }
+
+    @Transactional
+    fun applyRefillOnEnterAndGetStatus(
+        memberId: Long,
+        chatRoomId: Long,
+        characterId: Long,
+        globalFree: Int
+    ): RoomQuotaStatus {
+        val now = Instant.now()
+        val nowMillis = now.toEpochMilli()
+        val quota = repo.findForUpdate(memberId, chatRoomId) ?: repo.save(
+            ChatRoomQuota(
+                memberId = memberId,
+                chatRoomId = chatRoomId,
+                characterId = characterId,
+                remainingFree = 10,
+                remainingPaid = 0,
+                nextRechargeAt = null
+            )
+        )
+        // Lazy refill: nextRechargeAt이 현재를 지났으면 무료 10으로 리셋하고 next=null
+        if (quota.nextRechargeAt != null && quota.nextRechargeAt!! <= nowMillis) {
+            quota.remainingFree = 10
+            quota.nextRechargeAt = null
+        }
+
+        val total = calculateAvailableForRoom(
+            globalFree = globalFree,
+            roomFree = quota.remainingFree,
+            roomPaid = quota.remainingPaid
+        )
+        return RoomQuotaStatus(
+            totalRemaining = total,
+            nextRechargeAtEpochMillis = quota.nextRechargeAt,
+            remainingFree = quota.remainingFree,
+            remainingPaid = quota.remainingPaid
+        )
+    }
+
+    @Transactional
+    fun consumeOneForSend(
+        memberId: Long,
+        chatRoomId: Long,
+        globalFreeProvider: () -> Int,
+        consumeGlobalFree: () -> Unit
+    ): RoomQuotaStatus {
+        val now = Instant.now()
+        val nowMillis = now.toEpochMilli()
+        val quota = repo.findForUpdate(memberId, chatRoomId)
+            ?: throw SodaException("채팅방을 찾을 수 없습니다.")
+
+        // 충전 시간이 지났다면 무료 10으로 리셋하고 next=null
+        if (quota.nextRechargeAt != null && quota.nextRechargeAt!! <= nowMillis) {
+            quota.remainingFree = 10
+            quota.nextRechargeAt = null
+        }
+
+        // 1) 유료 우선 사용: 글로벌에 영향 없음
+        if (quota.remainingPaid > 0) {
+            quota.remainingPaid -= 1
+            val total = calculateAvailableForRoom(globalFreeProvider(), quota.remainingFree, quota.remainingPaid)
+            return RoomQuotaStatus(total, quota.nextRechargeAt, quota.remainingFree, quota.remainingPaid)
+        }
+
+        // 2) 무료 사용: 글로벌과 룸 동시에 조건 충족 필요
+        val globalFree = globalFreeProvider()
+        if (globalFree <= 0) {
+            // 전송 차단: 글로벌 무료가 0이며 유료도 0 → 전송 불가
+            throw SodaException("무료 쿼터가 소진되었습니다. 글로벌 무료 충전 이후 이용해 주세요.")
+        }
+        if (quota.remainingFree <= 0) {
+            // 전송 차단: 룸 무료가 0이며 유료도 0 → 전송 불가
+            val waitMillis = quota.nextRechargeAt
+            if (waitMillis != null && waitMillis > nowMillis) {
+                throw SodaException("채팅방 무료 쿼터가 소진되었습니다. 무료 충전 이후 이용해 주세요.")
+            } else {
+                throw SodaException("채팅방 무료 쿼터가 소진되었습니다. 잠시 후 다시 시도해 주세요.")
+            }
+        }
+
+        // 둘 다 가능 → 차감
+        consumeGlobalFree()
+        quota.remainingFree -= 1
+        if (quota.remainingFree == 0) {
+            // 무료가 0이 되는 순간 nextRechargeAt = 현재 + 6시간
+            quota.nextRechargeAt = now.plus(Duration.ofHours(6)).toEpochMilli()
+        }
+        val total = calculateAvailableForRoom(globalFreeProvider(), quota.remainingFree, quota.remainingPaid)
+        return RoomQuotaStatus(total, quota.nextRechargeAt, quota.remainingFree, quota.remainingPaid)
+    }
+
+    @Transactional
+    fun purchase(
+        memberId: Long,
+        chatRoomId: Long,
+        characterId: Long,
+        addPaid: Int = 40,
+        container: String
+    ): RoomQuotaStatus {
+        // 요구사항: 30캔 결제 및 UseCan에 방/캐릭터 기록
+        canPaymentService.spendCan(
+            memberId = memberId,
+            needCan = 30,
+            canUsage = CanUsage.CHAT_QUOTA_PURCHASE,
+            chatRoomId = chatRoomId,
+            characterId = characterId,
+            container = container
+        )
+
+        val quota = repo.findForUpdate(memberId, chatRoomId) ?: repo.save(
+            ChatRoomQuota(
+                memberId = memberId,
+                chatRoomId = chatRoomId,
+                characterId = characterId
+            )
+        )
+        quota.remainingPaid += addPaid
+        quota.nextRechargeAt = null
+
+        val total = quota.remainingPaid + quota.remainingFree
+        return RoomQuotaStatus(
+            totalRemaining = total,
+            nextRechargeAtEpochMillis = quota.nextRechargeAt,
+            remainingFree = quota.remainingFree,
+            remainingPaid = quota.remainingPaid
+        )
+    }
+
+    @Transactional
+    fun transferPaid(memberId: Long, fromChatRoomId: Long, toChatRoomId: Long, toCharacterId: Long) {
+        val from = repo.findForUpdate(memberId, fromChatRoomId) ?: return
+        if (from.remainingPaid <= 0) return
+        val to = repo.findForUpdate(memberId, toChatRoomId) ?: repo.save(
+            ChatRoomQuota(
+                memberId = memberId,
+                chatRoomId = toChatRoomId,
+                characterId = toCharacterId
+            )
+        )
+        to.remainingPaid += from.remainingPaid
+        from.remainingPaid = 0
+        // 유료 이관은 룸 무료 충전 시간에 영향을 주지 않음
+    }
+}
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/chat/room/service/ChatRoomService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/chat/room/service/ChatRoomService.kt
index 9b24ba9..1835fe5 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/chat/room/service/ChatRoomService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/chat/room/service/ChatRoomService.kt
@@ -5,6 +5,7 @@ import kr.co.vividnext.sodalive.can.use.CanUsage
 import kr.co.vividnext.sodalive.chat.character.image.CharacterImage
 import kr.co.vividnext.sodalive.chat.character.image.CharacterImageService
 import kr.co.vividnext.sodalive.chat.character.service.ChatCharacterService
+import kr.co.vividnext.sodalive.chat.quota.room.ChatRoomQuotaService
 import kr.co.vividnext.sodalive.chat.room.ChatMessage
 import kr.co.vividnext.sodalive.chat.room.ChatMessageType
 import kr.co.vividnext.sodalive.chat.room.ChatParticipant
@@ -52,6 +53,7 @@ class ChatRoomService(
     private val canPaymentService: kr.co.vividnext.sodalive.can.payment.CanPaymentService,
     private val imageCloudFront: kr.co.vividnext.sodalive.aws.cloudfront.ImageContentCloudFront,
     private val chatQuotaService: kr.co.vividnext.sodalive.chat.quota.ChatQuotaService,
+    private val chatRoomQuotaService: ChatRoomQuotaService,
 
     @Value("\${weraser.api-key}")
     private val apiKey: String,
@@ -376,8 +378,15 @@ class ChatRoomService(
         val messagesAsc = fetched.sortedBy { it.createdAt }
         val items = messagesAsc.map { toChatMessageItemDto(it, member) }
 
-        // 입장 시 Lazy refill 적용 후 상태 반환
-        val quotaStatus = chatQuotaService.applyRefillOnEnterAndGetStatus(member.id!!)
+        // 5-1) 글로벌 쿼터 Lazy refill
+        val globalStatus = chatQuotaService.applyRefillOnEnterAndGetStatus(member.id!!)
+        // 5-2) 룸 쿼터 Lazy refill + 상태
+        val roomStatus = chatRoomQuotaService.applyRefillOnEnterAndGetStatus(
+            memberId = member.id!!,
+            chatRoomId = effectiveRoom.id!!,
+            characterId = character.id!!,
+            globalFree = globalStatus.totalRemaining
+        )
 
         // 선택적 캐릭터 이미지 서명 URL 생성 처리
         // 요구사항: baseRoom이 조건 불만족으로 동일 캐릭터의 내 활성 방으로 라우팅된 경우(bg 이미지 요청 무시)에는 null로 처리
@@ -419,13 +428,42 @@ class ChatRoomService(
                 }
             }
 
+        // 권고안에 따른 next 계산
+        val nextForEnter: Long? = when {
+            // roomPaid==0 && roomFree>0 && global<=0 → 글로벌 next
+            roomStatus.remainingPaid == 0 && roomStatus.remainingFree > 0 && globalStatus.totalRemaining <= 0 ->
+                globalStatus.nextRechargeAtEpochMillis
+            // roomPaid==0 && roomFree==0 → (global<=0) ? max(roomNext, globalNext) : roomNext
+            roomStatus.remainingPaid == 0 && roomStatus.remainingFree == 0 -> {
+                val roomNext = roomStatus.nextRechargeAtEpochMillis
+                val globalNext = globalStatus.nextRechargeAtEpochMillis
+                if (globalStatus.totalRemaining <= 0) {
+                    if (roomNext == null) {
+                        globalNext
+                    } else if (globalNext == null) {
+                        roomNext
+                    } else {
+                        maxOf(
+                            roomNext,
+                            globalNext
+                        )
+                    }
+                } else {
+                    roomNext
+                }
+            }
+            // 그 외 기존 규칙: room total==0 → room next, else if global<=0 → global next, else null
+            roomStatus.totalRemaining == 0 -> roomStatus.nextRechargeAtEpochMillis
+            globalStatus.totalRemaining <= 0 -> globalStatus.nextRechargeAtEpochMillis
+            else -> null
+        }
         return ChatRoomEnterResponse(
             roomId = effectiveRoom.id!!,
             character = characterDto,
             messages = items,
             hasMoreMessages = hasMore,
-            totalRemaining = quotaStatus.totalRemaining,
-            nextRechargeAtEpoch = quotaStatus.nextRechargeAtEpochMillis,
+            totalRemaining = roomStatus.totalRemaining,
+            nextRechargeAtEpoch = nextForEnter,
             bgImageUrl = signedUrl
         )
     }
@@ -602,8 +640,13 @@ class ChatRoomService(
         val sessionId = room.sessionId
         val characterUUID = character.characterUUID
 
-        // 5) 쿼터 확인 및 차감
-        chatQuotaService.consumeOne(member.id!!)
+        // 5) 쿼터 확인 및 차감 (유료 우선, 무료 사용 시 글로벌과 룸 동시 차감)
+        val roomQuotaAfterConsume = chatRoomQuotaService.consumeOneForSend(
+            memberId = member.id!!,
+            chatRoomId = room.id!!,
+            globalFreeProvider = { chatQuotaService.getStatus(member.id!!).totalRemaining },
+            consumeGlobalFree = { chatQuotaService.consumeOneFree(member.id!!) }
+        )
 
         // 6) 외부 API 호출 (최대 3회 재시도)
         val characterReply = callExternalApiForChatSendWithRetry(userId, characterUUID, message, sessionId)
@@ -646,7 +689,21 @@ class ChatRoomService(
             hasAccess = true
         )
 
-        val status = chatQuotaService.getStatus(member.id!!)
+        // 발송 후 최신 잔여 수량 및 next 계산 규칙 적용
+        val statusTotalRemaining = roomQuotaAfterConsume.totalRemaining
+        val globalAfter = chatQuotaService.getStatus(member.id!!)
+        val statusNextRechargeAt: Long? = when {
+            // totalRemaining==0이고 (global<=0) → max(roomNext, globalNext)
+            statusTotalRemaining == 0 && globalAfter.totalRemaining <= 0 -> {
+                val roomNext = roomQuotaAfterConsume.nextRechargeAtEpochMillis
+                val globalNext = globalAfter.nextRechargeAtEpochMillis
+                if (roomNext == null) globalNext else if (globalNext == null) roomNext else maxOf(roomNext, globalNext)
+            }
+
+            statusTotalRemaining == 0 -> roomQuotaAfterConsume.nextRechargeAtEpochMillis
+            globalAfter.totalRemaining <= 0 -> globalAfter.nextRechargeAtEpochMillis
+            else -> null
+        }
 
         // 8) 트리거 매칭 → 이미지 메시지 추가 저장(있을 경우)
         val matchedImage = findTriggeredCharacterImage(character.id!!, characterReply)
@@ -676,15 +733,15 @@ class ChatRoomService(
             val imageDto = toChatMessageItemDto(imageMsg, member)
             return SendChatMessageResponse(
                 messages = listOf(textDto, imageDto),
-                totalRemaining = status.totalRemaining,
-                nextRechargeAtEpoch = status.nextRechargeAtEpochMillis
+                totalRemaining = statusTotalRemaining,
+                nextRechargeAtEpoch = statusNextRechargeAt
             )
         }
 
         return SendChatMessageResponse(
             messages = listOf(textDto),
-            totalRemaining = status.totalRemaining,
-            nextRechargeAtEpoch = status.nextRechargeAtEpochMillis
+            totalRemaining = statusTotalRemaining,
+            nextRechargeAtEpoch = statusNextRechargeAt
         )
     }
 
@@ -846,6 +903,8 @@ class ChatRoomService(
             memberId = member.id!!,
             needCan = 30,
             canUsage = CanUsage.CHAT_ROOM_RESET,
+            chatRoomId = chatRoomId,
+            characterId = character.id!!,
             container = container
         )
 
@@ -855,10 +914,14 @@ class ChatRoomService(
         // 4) 동일한 캐릭터와 새로운 채팅방 생성
         val created = createOrGetChatRoom(member, character.id!!)
 
-        // 5) 신규 채팅방 생성 성공 시 무료 채팅 횟수 10으로 설정
-        chatQuotaService.resetFreeToDefault(member.id!!)
-
-        // 6) 생성된 채팅방 데이터 반환
+        // 5) 신규 채팅방 생성 성공 시: 기존 방의 유료 쿼터를 새 방으로 이관
+        chatRoomQuotaService.transferPaid(
+            memberId = member.id!!,
+            fromChatRoomId = chatRoomId,
+            toChatRoomId = created.chatRoomId,
+            toCharacterId = character.id!!
+        )
+        // 글로벌 무료 쿼터는 UTC 20:00 기준 lazy 충전이므로 별도의 초기화 불필요
         return created
     }
 }