diff --git a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageAdapter.kt b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageAdapter.kt
index 5a9fb91a..6f0092db 100644
--- a/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageAdapter.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatMessageAdapter.kt
@@ -294,24 +294,6 @@ class ChatMessageAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
         return (p != null && c != null && p == c)
     }
 
-    /**
-     * 현재(position)와 다음 항목이 동일 발신자인지
-     */
-    fun isSameSenderWithNext(position: Int): Boolean {
-        if (position < 0 || position >= items.size - 1) return false
-        val curr = items[position]
-        val next = items[position + 1]
-        fun mineOf(item: ChatListItem): Boolean? = when (item) {
-            is ChatListItem.UserMessage -> item.data.mine
-            is ChatListItem.AiMessage -> item.data.mine
-            else -> null
-        }
-
-        val c = mineOf(curr)
-        val n = mineOf(next)
-        return (c != null && n != null && c == n)
-    }
-
     override fun getItemViewType(position: Int): Int {
         return when (items[position]) {
             is ChatListItem.UserMessage -> VIEW_TYPE_USER_MESSAGE
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 49a93967..bd4a76b8 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
@@ -606,7 +606,11 @@ class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
         // 2) 서버 통합 API로 동기화 및 UI 갱신
         val token = "Bearer ${SharedPreferenceManager.token}"
         val bgImageId = getSavedBackgroundImageId()
-        val networkDisposable = chatRepository.enterChatRoom(token = token, roomId = roomId, characterImageId = bgImageId)
+        val networkDisposable = chatRepository.enterChatRoom(
+            token = token,
+            roomId = roomId,
+            characterImageId = bgImageId
+        )
             .observeOn(AndroidSchedulers.mainThread())
             .subscribe({ response ->
                 // 캐릭터 정보 바인딩
@@ -846,8 +850,6 @@ class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
         binding.viewCharacterDim.isVisible = visible
     }
 
-    private fun bgUrlPrefKey(): String = "chat_bg_url_room_$roomId"
-
     fun setChatBackground(url: String) {
         binding.ivBackgroundProfile.load(url) {
             placeholder(R.drawable.ic_placeholder_profile)
@@ -855,24 +857,6 @@ class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
         }
     }
 
-    private fun applyBackgroundFromPrefsOrProfile(profileUrl: String) {
-        val key = bgUrlPrefKey()
-        val saved = prefs.getString(key, null)
-        val target = when {
-            !saved.isNullOrBlank() -> saved
-            profileUrl.isNotBlank() -> {
-                prefs.edit { putString(key, profileUrl) }
-                profileUrl
-            }
-            else -> null
-        }
-        if (!target.isNullOrBlank()) {
-            setChatBackground(target)
-        } else {
-            binding.ivBackgroundProfile.setImageResource(R.drawable.ic_placeholder_profile)
-        }
-    }
-
     fun getCharacterId(): Long = characterInfo?.characterId ?: 0L
 
     fun getCharacterProfileUrl(): String = characterInfo?.profileImageUrl ?: ""