diff --git a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageEntityMappers.kt b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageEntityMappers.kt
index 05cd0a65..11ccf9d5 100644
--- a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageEntityMappers.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageEntityMappers.kt
@@ -45,3 +45,17 @@ fun ServerChatMessage.toEntity(roomId: Long): ChatMessageEntity {
         createdAt = createdAt
     )
 }
+
+@Keep
+fun ServerChatMessage.toDomain(): ChatMessage {
+    return ChatMessage(
+        messageId = messageId,
+        message = message,
+        profileImageUrl = profileImageUrl,
+        mine = mine,
+        createdAt = createdAt,
+        status = MessageStatus.SENT,
+        localId = null,
+        isGrouped = false
+    )
+}
diff --git a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt
index f8fb092d..da1ac217 100644
--- a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt
@@ -17,6 +17,7 @@ import kr.co.vividnext.sodalive.R
 import kr.co.vividnext.sodalive.base.BaseActivity
 import kr.co.vividnext.sodalive.chat.character.detail.CharacterType
 import kr.co.vividnext.sodalive.databinding.ActivityChatRoomBinding
+import org.koin.android.ext.android.inject
 
 class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
     ActivityChatRoomBinding::inflate
@@ -25,6 +26,9 @@ class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
     private lateinit var chatAdapter: ChatMessageAdapter
     private lateinit var layoutManager: LinearLayoutManager
 
+    // Repository 주입 (7.1 초기 데이터 로딩)
+    private val chatRepository: ChatRepository by inject()
+
     // 5.2 무한 스크롤/자동 스크롤 상태
     private val items: MutableList<ChatListItem> = mutableListOf()
     private var isLoading: Boolean = false
@@ -348,11 +352,44 @@ class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
     // endregion 6.2 Send flow
 
     private fun loadInitialMessages() {
-        // 7.x에서 Repository 연동 및 초기 로딩 구현 예정
-        items.clear()
-        chatAdapter.setItems(items)
-        // 초기 진입 시 최신 메시지로 스크롤 (하단)
-        scrollToBottom()
+        // 7.1 초기 데이터 로딩 구현: 통합 API 호출 + 로컬 동기화 결과를 UI에 반영
+        isLoading = true
+        val token = "Bearer ${kr.co.vividnext.sodalive.common.SharedPreferenceManager.token}"
+
+        val disposable = chatRepository.enterChatRoom(token = token, roomId = roomId)
+            .observeOn(io.reactivex.rxjava3.android.schedulers.AndroidSchedulers.mainThread())
+            .subscribe({ response ->
+                // 캐릭터 정보 바인딩
+                setCharacterInfo(response.character)
+
+                // 메시지 정렬(오래된 -> 최신) 후 도메인/UI 모델로 변환
+                val sorted = response.messages.sortedBy { it.createdAt }
+                val chatItems = sorted.map { serverMsg ->
+                    val domain = serverMsg.toDomain()
+                    if (domain.mine) {
+                        ChatListItem.UserMessage(domain)
+                    } else {
+                        ChatListItem.AiMessage(domain, response.character.name)
+                    }
+                }
+
+                items.clear()
+                items.addAll(chatItems)
+                chatAdapter.setItems(items)
+
+                // 페이지 상태 갱신
+                hasMoreMessages = response.hasMoreMessages
+                nextCursor = sorted.firstOrNull()?.createdAt
+
+                // 최신 메시지 위치로
+                scrollToBottom()
+                isLoading = false
+            }, { error ->
+                isLoading = false
+                showToast(error.message ?: "채팅방 데이터를 불러오지 못했습니다.")
+            })
+
+        compositeDisposable.add(disposable)
     }
 
     // region 5.2 helper methods