diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.ts
index 02bcd253..454b67d3 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.ts
@@ -59,7 +59,7 @@ export class LeftSideComponent implements OnInit {
     ];
   }
 
-  async onClickNewChat() {
+  async onClickNewChat(type: string = 'NORMAL') {
     const result = await this.dialogService.open<
       CreateChatDialogComponent,
       CreateChatDialogData,
@@ -69,7 +69,7 @@ export class LeftSideComponent implements OnInit {
       height: '500px',
       data: {
         type: UserSelectDialogType.NewChat,
-        title: 'New Chat'
+        title: type === 'TIMER' ? 'New Timer Chat' : 'New Chat'
       }
     });
 
@@ -78,7 +78,13 @@ export class LeftSideComponent implements OnInit {
         const userSeqs: number[] = [];
         result.selectedUserList.map(user => userSeqs.push(user.seq));
 
-        this.store.dispatch(ChatStore.openRoom({ userSeqList: userSeqs }));
+        if (type === 'NORMAL') {
+          this.store.dispatch(ChatStore.openRoom({ userSeqList: userSeqs }));
+        } else if (type === 'TIMER') {
+          this.store.dispatch(
+            ChatStore.openRoom({ userSeqList: userSeqs, isTimeRoom: true })
+          );
+        }
       }
     }
   }
@@ -134,11 +140,12 @@ export class LeftSideComponent implements OnInit {
     switch (btn.divisionType) {
       case 'NEW_CHAT':
         {
-          this.onClickNewChat();
+          this.onClickNewChat('NORMAL');
         }
         break;
       case 'NEW_TIMER_CHAT':
         {
+          this.onClickNewChat('TIMER');
         }
         break;
     }
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.html
index 24be9c99..7a068900 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.html
@@ -18,6 +18,9 @@
       <div class="room-name">
         {{ getRoomName() }}
       </div>
+      <div *ngIf="!!roomInfo && roomInfo.isTimeRoom">
+        <mat-icon>timer</mat-icon> {{ getConvertTimer(roomInfo.timeRoomInterval) }}
+      </div>
       <div class="room-option">
         <button
           *ngIf="!!roomInfo"
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
index b1b6bb8b..32b74255 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
@@ -199,6 +199,18 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewChecked {
     }
   }
 
+  getConvertTimer(timerInterval: number, unit: number = 1) {
+    if (timerInterval >= 0 && timerInterval < 60 * unit) {
+      return Math.floor((timerInterval / 1) * unit) + ' 초';
+    } else if (timerInterval >= 60 * unit && timerInterval < 3600 * unit) {
+      return Math.floor(((timerInterval / 1) * unit) / 60) + ' 분';
+    } else if (timerInterval >= 3600 * unit && timerInterval <= 86400 * unit) {
+      return Math.floor(((timerInterval / 1) * unit) / 60 / 60) + ' 시간';
+    } else {
+      return '';
+    }
+  }
+
   selectContact() {}
 
   async onSendMessage(message: string) {
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/chat/actions.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/chat/actions.ts
index 2da55490..76404fad 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/chat/actions.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/chat/actions.ts
@@ -41,5 +41,5 @@ export const massTalkDownloadFailure = createAction(
 
 export const openRoom = createAction(
   '[Messenger::Chat] Open Room',
-  props<{ userSeqList: number[] }>()
+  props<{ userSeqList: number[]; isTimeRoom?: boolean }>()
 );
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/room/actions.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/room/actions.ts
index fe6af385..5184c660 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/room/actions.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/room/actions.ts
@@ -13,7 +13,9 @@ import {
   OpenRequest,
   OpenResponse,
   ExitRequest,
-  ExitResponse
+  ExitResponse,
+  Open3Request,
+  Open3Response
 } from '@ucap-webmessenger/protocol-room';
 import { ReadNotification } from '@ucap-webmessenger/protocol-event';
 
@@ -87,19 +89,32 @@ export const open = createAction(
   '[Messenger::Room] Open',
   props<{ req: OpenRequest }>()
 );
-
 export const openSuccess = createAction(
   '[Messenger::Room] Open Success',
   props<{
     res: OpenResponse;
   }>()
 );
-
 export const openFailure = createAction(
   '[Messenger::Room] Open Failure',
   props<{ error: any }>()
 );
 
+export const openTimer = createAction(
+  '[Messenger::Room] Open Timer',
+  props<{ req: Open3Request }>()
+);
+export const openTimerSuccess = createAction(
+  '[Messenger::Room] Open Timer Success',
+  props<{
+    res: Open3Response;
+  }>()
+);
+export const openTimerFailure = createAction(
+  '[Messenger::Room] Open Timer Failure',
+  props<{ error: any }>()
+);
+
 export const exit = createAction(
   '[Messenger::Room] Exit',
   props<ExitRequest>()
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/room/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/room/effects.ts
index 63dd6794..ba8c3220 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/room/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/room/effects.ts
@@ -29,7 +29,8 @@ import {
   UserData,
   UpdateResponse,
   OpenResponse,
-  ExitResponse
+  ExitResponse,
+  Open3Response
 } from '@ucap-webmessenger/protocol-room';
 
 import * as ChatStore from '@app/store/messenger/chat';
@@ -51,7 +52,10 @@ import {
   openFailure,
   exit,
   exitSuccess,
-  exitFailure
+  exitFailure,
+  openTimer,
+  openTimerSuccess,
+  openTimerFailure
 } from './actions';
 import { SessionStorageService } from '@ucap-webmessenger/web-storage';
 import { LoginInfo, KEY_LOGIN_INFO } from '@app/types';
@@ -168,7 +172,6 @@ export class Effects {
       })
     )
   );
-
   openSuccess$ = createEffect(() =>
     this.actions$.pipe(
       ofType(openSuccess),
@@ -178,6 +181,29 @@ export class Effects {
     )
   );
 
+  openTimer$ = createEffect(() =>
+    this.actions$.pipe(
+      ofType(openTimer),
+      map(action => action.req),
+      exhaustMap(req => {
+        return this.roomProtocolService.open3(req).pipe(
+          map((res: Open3Response) => {
+            return openTimerSuccess({ res });
+          }),
+          catchError(error => of(openTimerFailure({ error })))
+        );
+      })
+    )
+  );
+  openTimerSuccess$ = createEffect(() =>
+    this.actions$.pipe(
+      ofType(openTimerSuccess),
+      map(action => {
+        return ChatStore.selectedRoom({ roomSeq: action.res.roomSeq });
+      })
+    )
+  );
+
   exit$ = createEffect(() =>
     this.actions$.pipe(
       ofType(exit),
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
index 2e3f501d..cc5add6d 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
@@ -1,4 +1,4 @@
-import { GroupProtocolService } from './../../../../../../ucap-webmessenger-protocol-group/src/lib/services/group-protocol.service';
+import { openTimer } from './../room/actions';
 import { Injectable } from '@angular/core';
 
 import { Actions, ofType, createEffect } from '@ngrx/effects';
@@ -87,6 +87,7 @@ import {
 } from '@ucap-webmessenger/protocol-room';
 import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
 import {
+  GroupProtocolService,
   AddResponse as GroupAddResponse,
   UpdateResponse as GroupUpdateResponse,
   DelResponse as GroupDelResponse
@@ -299,6 +300,12 @@ export class Effects {
                 state.account.authentication.loginRes as LoginResponse
             )
           ),
+          this.store.pipe(
+            select(
+              (state: any) =>
+                state.messenger.sync.room.entities as Dictionary<RoomInfo>
+            )
+          ),
           this.store.pipe(
             select(
               (state: any) =>
@@ -316,7 +323,7 @@ export class Effects {
             )
           )
         ),
-        tap(([action, loginRes, roomUsers, roomUserShorts]) => {
+        tap(([action, loginRes, roomInfos, roomUsers, roomUserShorts]) => {
           const userSeqList = [...action.userSeqList, loginRes.userSeq];
           let roomSeq = null;
 
@@ -325,6 +332,20 @@ export class Effects {
               const element = roomUsers[key];
               if (userSeqList.length === element.userInfos.length) {
                 roomSeq = key;
+                if (!!action.isTimeRoom && action.isTimeRoom) {
+                  // 타이머 방
+                  if (!roomInfos[key].isTimeRoom) {
+                    roomSeq = null;
+                    continue;
+                  }
+                } else {
+                  // 일반 방
+                  if (roomInfos[key].isTimeRoom) {
+                    roomSeq = null;
+                    continue;
+                  }
+                }
+                // user check
                 for (const roomUserInfo of element.userInfos) {
                   if (-1 === userSeqList.indexOf(roomUserInfo.seq)) {
                     roomSeq = null;
@@ -340,6 +361,20 @@ export class Effects {
               const element = roomUserShorts[key];
               if (userSeqList.length === element.userInfos.length) {
                 roomSeq = key;
+                if (!!action.isTimeRoom && action.isTimeRoom) {
+                  // 타이머 방
+                  if (!roomInfos[key].isTimeRoom) {
+                    roomSeq = null;
+                    continue;
+                  }
+                } else {
+                  // 일반 방
+                  if (roomInfos[key].isTimeRoom) {
+                    roomSeq = null;
+                    continue;
+                  }
+                }
+                // user check
                 for (const roomUserDetailData of element.userInfos) {
                   if (-1 === userSeqList.indexOf(roomUserDetailData.seq)) {
                     roomSeq = null;
@@ -362,11 +397,27 @@ export class Effects {
             return;
           }
 
-          this.store.dispatch(
-            RoomStore.open({
-              req: { divCd: 'DivCode', userSeqs: userSeqList }
-            })
-          );
+          if (!!action.isTimeRoom && action.isTimeRoom) {
+            // 타이머 방
+            this.store.dispatch(
+              RoomStore.openTimer({
+                req: {
+                  divCd: 'DivCodeT',
+                  roomName: '',
+                  isTimerRoom: true,
+                  timerRoomInterval: 24 * 60 * 60, // 24h default
+                  userSeqs: userSeqList
+                }
+              })
+            );
+          } else {
+            // 일반 방
+            this.store.dispatch(
+              RoomStore.open({
+                req: { divCd: 'DivCode', userSeqs: userSeqList }
+              })
+            );
+          }
         })
       ),
     { dispatch: false }
diff --git a/projects/ucap-webmessenger-protocol-room/src/lib/protocols/open.ts b/projects/ucap-webmessenger-protocol-room/src/lib/protocols/open.ts
index b357ccb6..fa3bdd60 100644
--- a/projects/ucap-webmessenger-protocol-room/src/lib/protocols/open.ts
+++ b/projects/ucap-webmessenger-protocol-room/src/lib/protocols/open.ts
@@ -123,17 +123,23 @@ export const encodeOpen3: ProtocolEncoder<Open3Request> = (
   req: Open3Request
 ) => {
   const bodyList: PacketBody[] = [];
+  let roomName: string = req.roomName.trim();
+  if (!!roomName && roomName.length === 0) {
+    roomName = ' ';
+  }
 
-  bodyList.push({ type: PacketBodyValue.String, value: req.divCd });
-  bodyList.push({ type: PacketBodyValue.String, value: req.roomName.trim() });
-  bodyList.push({
-    type: PacketBodyValue.String,
-    value: req.isTimerRoom === true ? 'Y' : 'N'
-  });
-  bodyList.push({
-    type: PacketBodyValue.Integer,
-    value: req.isTimerRoom !== true ? 0 : req.timerRoomInterval
-  });
+  bodyList.push(
+    { type: PacketBodyValue.String, value: req.divCd },
+    { type: PacketBodyValue.String, value: roomName },
+    {
+      type: PacketBodyValue.String,
+      value: req.isTimerRoom === true ? 'Y' : 'N'
+    },
+    {
+      type: PacketBodyValue.Integer,
+      value: req.isTimerRoom !== true ? 0 : req.timerRoomInterval
+    }
+  );
   for (const userSeq of req.userSeqs) {
     bodyList.push({ type: PacketBodyValue.Integer, value: userSeq });
   }
diff --git a/projects/ucap-webmessenger-ui-room/src/lib/components/list-item.component.html b/projects/ucap-webmessenger-ui-room/src/lib/components/list-item.component.html
index 901e1537..93e87030 100644
--- a/projects/ucap-webmessenger-ui-room/src/lib/components/list-item.component.html
+++ b/projects/ucap-webmessenger-ui-room/src/lib/components/list-item.component.html
@@ -44,7 +44,9 @@
       </mat-checkbox>
     </dd>
   </dl>
-  <!-- <span class="noti">1</span> -->
+  <span *ngIf="roomInfo.isTimeRoom">
+    <mat-icon>timer</mat-icon>
+  </span>
   <span
     class="notiBadge"
     *ngIf="roomInfo.noReadCnt > 0"