diff --git a/projects/ucap-webmessenger-api/src/lib/utils/json.util.ts b/projects/ucap-webmessenger-api/src/lib/utils/json.util.ts
index 25f8964a..2f7ccc39 100644
--- a/projects/ucap-webmessenger-api/src/lib/utils/json.util.ts
+++ b/projects/ucap-webmessenger-api/src/lib/utils/json.util.ts
@@ -1,6 +1,10 @@
 import { JsonObject } from 'type-fest';
 
 export class JsonAnalization {
+  /**
+   * Raw string Analization for JSON string.
+   * @description Editing with string.util.ts
+   */
   public static receiveAnalization(jsonStr: string): JsonObject {
     const startJson = jsonStr.indexOf('{');
     const endJson = jsonStr.lastIndexOf('}');
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.html
index 9a94a635..ac633a00 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.html
@@ -21,7 +21,17 @@
   </mat-form-field>
 </div>
 <div class="app-layout-chat-left-sidenav-chat-list" perfectScrollbar>
-  <cdk-virtual-scroll-viewport
+  <ucap-room-list-item
+    *ngFor="let room of getRoomList()"
+    [loginRes]="loginRes"
+    [roomInfo]="room"
+    [roomUserInfo]="getRoomUserList(room)"
+    [sessionVerinfo]="sessionVerinfo"
+    (click)="onSelectedRoom(room)"
+    (contextmenu)="onContextMenuChat($event, room)"
+  >
+  </ucap-room-list-item>
+  <!-- <cdk-virtual-scroll-viewport
     itemSize="20"
     class="app-layout-chat-left-sidenav-chat-list-viewport"
   >
@@ -35,7 +45,7 @@
       (contextmenu)="onContextMenuChat($event, room)"
     >
     </ucap-room-list-item>
-  </cdk-virtual-scroll-viewport>
+  </cdk-virtual-scroll-viewport> -->
 </div>
 
 <div
diff --git a/projects/ucap-webmessenger-app/src/app/services/notification.service.ts b/projects/ucap-webmessenger-app/src/app/services/notification.service.ts
index e6a268f7..ded98f36 100644
--- a/projects/ucap-webmessenger-app/src/app/services/notification.service.ts
+++ b/projects/ucap-webmessenger-app/src/app/services/notification.service.ts
@@ -20,7 +20,9 @@ import {
   SSVC_TYPE_EVENT_READ_NOTI,
   SSVC_TYPE_EVENT_CANCEL_NOTI,
   SSVC_TYPE_EVENT_DEL_RES,
-  Info
+  Info,
+  SSVC_TYPE_EVENT_SEND_RES,
+  SSVC_TYPE_EVENT_READ_RES
 } from '@ucap-webmessenger/protocol-event';
 import {
   InfoProtocolService,
@@ -104,6 +106,7 @@ export class AppNotificationService {
       .pipe(
         tap(notiOrRes => {
           switch (notiOrRes.SSVC_TYPE) {
+            case SSVC_TYPE_EVENT_SEND_RES:
             case SSVC_TYPE_EVENT_SEND_NOTI:
               {
                 const noti = notiOrRes as SendNotification;
@@ -119,6 +122,7 @@ export class AppNotificationService {
                 );
               }
               break;
+            case SSVC_TYPE_EVENT_READ_RES:
             case SSVC_TYPE_EVENT_READ_NOTI:
               {
                 // 대화방 unread count 처리.
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
index 7ae76dc2..eeacf52a 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
@@ -39,6 +39,8 @@ export const newInfo = createAction(
   props<{
     roomSeq: string;
     info: Info;
+    SVC_TYPE?: number;
+    SSVC_TYPE?: number;
   }>()
 );
 
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
index 7e928630..84cca3d3 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
@@ -25,6 +25,7 @@ import {
   Info,
   InfoResponse,
   EventProtocolService,
+  SVC_TYPE_EVENT,
   SSVC_TYPE_EVENT_INFO_DATA,
   SSVC_TYPE_EVENT_INFO_RES,
   SendResponse,
@@ -207,7 +208,12 @@ export class Effects {
           };
 
           this.store.dispatch(
-            newInfo({ roomSeq: res.roomSeq, info: appendInfo })
+            newInfo({
+              roomSeq: res.roomSeq,
+              info: appendInfo,
+              SVC_TYPE: res.SVC_TYPE,
+              SSVC_TYPE: res.SSVC_TYPE
+            })
           );
         })
       );
@@ -231,7 +237,12 @@ export class Effects {
           };
 
           this.store.dispatch(
-            newInfo({ roomSeq: noti.roomSeq, info: appendInfo })
+            newInfo({
+              roomSeq: noti.roomSeq,
+              info: appendInfo,
+              SVC_TYPE: noti.SVC_TYPE,
+              SSVC_TYPE: noti.SSVC_TYPE
+            })
           );
         })
       );
@@ -368,15 +379,25 @@ export class Effects {
           }
 
           // not opened room :: unread count increased
-          if (!roomInfo || roomInfo.roomSeq !== action.roomSeq) {
-            if (!!trgtRoomInfos && !!trgtRoomInfos[action.roomSeq]) {
-              const noReadCnt = trgtRoomInfos[action.roomSeq].noReadCnt;
-              this.store.dispatch(
-                SyncStore.updateUnreadCount({
-                  roomSeq: action.roomSeq,
-                  noReadCnt: noReadCnt + 1
-                })
-              );
+          if (
+            action.SVC_TYPE === SVC_TYPE_EVENT &&
+            action.SSVC_TYPE === SSVC_TYPE_EVENT_INFO_RES
+          ) {
+            /**
+             * 다른 디바이스에서 대화를 송신 할경우 RES 가 noti 로 유입될 수 있다.
+             * 이때 unread count 를 중가하지 않는다.
+             */
+          } else {
+            if (!roomInfo || roomInfo.roomSeq !== action.roomSeq) {
+              if (!!trgtRoomInfos && !!trgtRoomInfos[action.roomSeq]) {
+                const noReadCnt = trgtRoomInfos[action.roomSeq].noReadCnt;
+                this.store.dispatch(
+                  SyncStore.updateUnreadCount({
+                    roomSeq: action.roomSeq,
+                    noReadCnt: noReadCnt + 1
+                  })
+                );
+              }
             }
           }
 
diff --git a/projects/ucap-webmessenger-protocol-event/src/lib/services/event-protocol.service.ts b/projects/ucap-webmessenger-protocol-event/src/lib/services/event-protocol.service.ts
index f8d32533..bf1baa70 100644
--- a/projects/ucap-webmessenger-protocol-event/src/lib/services/event-protocol.service.ts
+++ b/projects/ucap-webmessenger-protocol-event/src/lib/services/event-protocol.service.ts
@@ -34,7 +34,9 @@ import {
   SSVC_TYPE_EVENT_CANCEL_NOTI,
   SSVC_TYPE_EVENT_SEND_NOTI,
   SSVC_TYPE_EVENT_READ_NOTI,
-  SSVC_TYPE_EVENT_DEL_RES
+  SSVC_TYPE_EVENT_DEL_RES,
+  SSVC_TYPE_EVENT_SEND_RES,
+  SSVC_TYPE_EVENT_READ_RES
 } from '../types/service';
 import {
   SendRequest,
@@ -92,11 +94,13 @@ export class EventProtocolService {
         filter(message => message.serviceType === SVC_TYPE_EVENT),
         tap(message => {
           switch (message.subServiceType) {
+            case SSVC_TYPE_EVENT_SEND_RES:
             case SSVC_TYPE_EVENT_SEND_NOTI:
               {
                 this.notificationSubject.next(decodeSendNotification(message));
               }
               break;
+            case SSVC_TYPE_EVENT_READ_RES:
             case SSVC_TYPE_EVENT_READ_NOTI:
               {
                 this.notificationSubject.next(decodeReadNotification(message));
diff --git a/projects/ucap-webmessenger-ui/src/lib/utils/string.util.ts b/projects/ucap-webmessenger-ui/src/lib/utils/string.util.ts
index d8f9f272..7fab2588 100644
--- a/projects/ucap-webmessenger-ui/src/lib/utils/string.util.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/utils/string.util.ts
@@ -37,6 +37,7 @@ export class StringUtil {
 
   /**
    * Json String Analization.
+   * @description Editing with json.util.ts
    */
   public static receiveAnalization(jsonStr: string): JsonObject {
     const startJson = jsonStr.indexOf('{');