diff --git a/app/src/main/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModel.kt b/app/src/main/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModel.kt
index ecd82520..4c1b7e7c 100644
--- a/app/src/main/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModel.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModel.kt
@@ -42,10 +42,12 @@ class DmChatRoomViewModel(
     private var nextCursor: Long? = null
     private var isLoadingOlder: Boolean = false
     private var isSending: Boolean = false
+    private var isRealtimeJoining: Boolean = false
     private var isRealtimeConnected: Boolean = false
     private var shouldReconnectRealtime: Boolean = false
     private var currentAuthToken: String = ""
     private var currentRealtimeToken: String = ""
+    private var currentRealtimeRoomId: Long = 0L
     private var reconnectDisposable: Disposable? = null
     private var localMessageSequence: Long = 0L
     private val mainHandler = Handler(Looper.getMainLooper())
@@ -179,10 +181,14 @@ class DmChatRoomViewModel(
 
     private fun connectRealtime(token: String) {
         val roomId = currentRoomId
-        if (roomId <= 0L || isRealtimeConnected || !shouldReconnectRealtime && currentRealtimeToken.isNotEmpty()) return
+        if (roomId <= 0L || isRealtimeConnected && currentRealtimeRoomId == roomId) return
+        if (isRealtimeJoining && currentRealtimeRoomId == roomId) return
+        if (!shouldReconnectRealtime && currentRealtimeToken.isNotEmpty() && currentRealtimeRoomId == roomId) return
 
         currentRealtimeToken = token
-        isRealtimeConnected = true
+        currentRealtimeRoomId = roomId
+        isRealtimeJoining = true
+        isRealtimeConnected = false
         shouldReconnectRealtime = true
         reconnectDisposable?.dispose()
         reconnectDisposable = null
@@ -195,6 +201,7 @@ class DmChatRoomViewModel(
 
                 override fun onFailure(throwable: Throwable) {
                     scheduleRealtimeCallback {
+                        isRealtimeJoining = false
                         isRealtimeConnected = false
                         throwable.message?.let { Logger.e(it) }
                         scheduleRealtimeReconnect()
@@ -211,6 +218,8 @@ class DmChatRoomViewModel(
 
         shouldReconnectRealtime = false
         currentRealtimeToken = ""
+        currentRealtimeRoomId = 0L
+        isRealtimeJoining = false
         isRealtimeConnected = false
         reconnectDisposable?.dispose()
         reconnectDisposable = null
@@ -247,6 +256,9 @@ class DmChatRoomViewModel(
         mainHandler.removeCallbacksAndMessages(null)
         reconnectDisposable?.dispose()
         reconnectDisposable = null
+        currentRealtimeRoomId = 0L
+        isRealtimeJoining = false
+        isRealtimeConnected = false
         repository.closeSocket()
         super.onCleared()
     }
@@ -329,7 +341,11 @@ class DmChatRoomViewModel(
 
     private fun handleSocketEvent(event: DmChatSocketEvent, token: String) {
         when (event) {
-            DmChatSocketEvent.Joined -> syncLatestMessagesAfterReconnect(token = token)
+            DmChatSocketEvent.Joined -> {
+                isRealtimeJoining = false
+                isRealtimeConnected = true
+                syncLatestMessagesAfterReconnect(token = token)
+            }
             is DmChatSocketEvent.Message -> onRealtimeMessage(event.message)
             is DmChatSocketEvent.SendAck -> handleSendAck(event.requestId, event.message)
             is DmChatSocketEvent.Error -> event.requestId?.let { markLocalMessageFailed(it) }
diff --git a/app/src/test/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModelTest.kt b/app/src/test/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModelTest.kt
index b3339e7e..ebd6f2a8 100644
--- a/app/src/test/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModelTest.kt
+++ b/app/src/test/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModelTest.kt
@@ -323,9 +323,11 @@ class DmChatRoomViewModelTest {
         viewModel.enter(roomId = 10L, creatorId = 0L)
 
         viewModel.connectRealtime()
+        assertEquals(false, viewModel.isRealtimeConnectedForTest())
         socketFactory.emitJoined()
 
         assertEquals(listOf(RealtimeConnectCall("test-token", 10L)), socketFactory.connectCalls)
+        assertEquals(true, viewModel.isRealtimeConnectedForTest())
         assertEquals(listOf(MessagesCall("Bearer test-token", 10L, null, 20)), api.messagesCalls)
         val state = viewModel.chatRoomStateLiveData.requireValue() as DmChatRoomUiState.Content
         assertEquals(listOf(1L, 2L), state.messages.map { it.messageId })
@@ -340,6 +342,8 @@ class DmChatRoomViewModelTest {
         viewModel.connectRealtime()
 
         assertEquals(listOf(RealtimeConnectCall("test-token", 10L)), socketFactory.connectCalls)
+        assertEquals(1, socketFactory.webSocket.sentTexts.size)
+        assertEquals("JOIN_ROOM", socketFactory.webSocket.sentJsonAt(0).get("type").asString)
     }
 
     @Test
@@ -651,6 +655,12 @@ class DmChatRoomViewModelTest {
             method.isAccessible = true
             method.invoke(this)
         }
+
+        fun DmChatRoomViewModel.isRealtimeConnectedForTest(): Boolean {
+            val field = DmChatRoomViewModel::class.java.getDeclaredField("isRealtimeConnected")
+            field.isAccessible = true
+            return field.getBoolean(this)
+        }
     }
 }