diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/main-contents.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/main-contents.component.html
index 402303dc..05987d7a 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/main-contents.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/main-contents.component.html
@@ -13,7 +13,7 @@
   (closeRightDrawer)="onCloseRightDrawer()"
   (sendCall)="onClickSendClickToCall($event)"
 ></app-layout-messenger-messages>
-
+<!-- 아래와 같이 display 효과를 쓰려면 block 대산 flex 사용. (화면 전환이 매끄럽지만 스크롤이 그대로인 문제 있음.) -->
 <app-layout-messenger-organization
   (openProfile)="onClickOpenProfile($event)"
   (createConference)="onClickConferenceCreate($event)"
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/main-contents/messages.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/main-contents/messages.component.ts
index 95f71b4b..77b16a8d 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/main-contents/messages.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/main-contents/messages.component.ts
@@ -74,7 +74,8 @@ import {
   UserSelectDialogType,
   RightDrawer,
   KEY_STICKER_HISTORY,
-  KEY_AUTH_INFO
+  KEY_AUTH_INFO,
+  MainMenu
 } from '@app/types';
 import {
   RoomInfo,
@@ -191,6 +192,8 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
   environmentsInfo: EnvironmentsInfo;
   authInfo: AuthResponse;
 
+  unreadSubscription: Subscription;
+
   loginResSubscription: Subscription;
   loginResSubject = new BehaviorSubject<LoginResponse>(undefined);
 
@@ -300,6 +303,35 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
         this.loginResSubject.next(loginRes);
       });
 
+    this.unreadSubscription = combineLatest([
+      this.store.pipe(select(AppStore.MessengerSelector.RoomSelector.roomInfo)),
+      this.store.pipe(
+        select(AppStore.MessengerSelector.SettingsSelector.gnbMenuIndex)
+      ),
+      this.store.pipe(
+        select(AppStore.MessengerSelector.EventSelector.selectAllInfoList)
+      )
+    ])
+      .pipe(
+        map(([roomInfo, gnbMenuIndex, eventList]) => {
+          if (
+            !!roomInfo &&
+            !!roomInfo.roomSeq &&
+            !!eventList &&
+            eventList.length > 0 &&
+            gnbMenuIndex !== MainMenu.Organization
+          ) {
+            this.store.dispatch(
+              EventStore.read({
+                roomSeq: roomInfo.roomSeq,
+                lastReadSeq: eventList[eventList.length - 1].seq
+              })
+            );
+          }
+        })
+      )
+      .subscribe();
+
     this.roomInfoSubscription = this.store
       .pipe(select(AppStore.MessengerSelector.RoomSelector.roomInfo))
       .subscribe(roomInfo => {
@@ -505,6 +537,9 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
     if (!!this.loginResSubscription) {
       this.loginResSubscription.unsubscribe();
     }
+    if (!!this.unreadSubscription) {
+      this.unreadSubscription.unsubscribe();
+    }
     if (!!this.roomInfoSubscription) {
       this.roomInfoSubscription.unsubscribe();
     }
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 0728adae..6ac6a5cc 100644
--- a/projects/ucap-webmessenger-app/src/app/services/notification.service.ts
+++ b/projects/ucap-webmessenger-app/src/app/services/notification.service.ts
@@ -275,12 +275,53 @@ export class AppNotificationService {
                     noti
                   );
 
+                  // Event..
                   this.store.dispatch(
                     EventStore.sendNotification({
                       noti
                     })
                   );
 
+                  // unread count..
+                  if (
+                    !!curRoomInfo &&
+                    !!curRoomInfo.roomSeq &&
+                    curRoomInfo.roomSeq === noti.roomSeq &&
+                    gnbMenuIndex !== MainMenu.Organization
+                  ) {
+                    // 현재 방이 열려 있고, 조직도탭을 보고 있지 않다면 대화방을 보고 있다고 판단하고 event_read_req 한다.
+                    this.store.dispatch(
+                      EventStore.read({
+                        roomSeq: noti.roomSeq,
+                        lastReadSeq: noti.info.seq
+                      })
+                    );
+                  } else {
+                    // not opened room :: unread count increased
+                    if (notiOrRes.SSVC_TYPE === SSVC_TYPE_EVENT_SEND_RES) {
+                      /**
+                       * 다른 디바이스에서 대화를 송신 할경우 RES 가 noti 로 유입될 수 있다.
+                       * 이때 unread count 를 중가하지 않는다.
+                       */
+                    } else {
+                      if (
+                        !!roomList &&
+                        !!roomList[noti.roomSeq] &&
+                        noti.info.type !== EventType.Join &&
+                        noti.info.type !== EventType.Exit &&
+                        noti.info.type !== EventType.ForcedExit
+                      ) {
+                        const noReadCnt = roomList[noti.roomSeq].noReadCnt;
+                        this.store.dispatch(
+                          SyncStore.updateUnreadCount({
+                            roomSeq: noti.roomSeq,
+                            noReadCnt: noReadCnt + 1
+                          })
+                        );
+                      }
+                    }
+                  }
+
                   // notification..
                   if (notiOrRes.SSVC_TYPE === SSVC_TYPE_EVENT_SEND_NOTI) {
                     let doNoti = true;
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 f0fc2253..f01a16cb 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
@@ -95,7 +95,12 @@ import {
   RoomProtocolService,
   OpenResponse
 } from '@ucap-webmessenger/protocol-room';
-import { LoginInfo, KEY_LOGIN_INFO, EnvironmentsInfo } from '@app/types';
+import {
+  LoginInfo,
+  KEY_LOGIN_INFO,
+  EnvironmentsInfo,
+  MainMenu
+} from '@app/types';
 import { Dictionary } from '@ngrx/entity';
 import { openSuccess, openFailure } from '../room';
 import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
@@ -914,18 +919,6 @@ export class Effects {
           if (!!roomInfo && roomInfo.roomSeq === action.roomSeq) {
             this.store.dispatch(appendInfoList({ info: action.info }));
 
-            if (
-              action.SVC_TYPE === SVC_TYPE_EVENT &&
-              action.SSVC_TYPE === SSVC_TYPE_EVENT_SEND_NOTI
-            ) {
-              this.store.dispatch(
-                read({
-                  roomSeq: action.roomSeq,
-                  lastReadSeq: action.info.seq
-                })
-              );
-            }
-
             if (action.info.type === EventType.File) {
               // File 정보 수집.
               this.store.dispatch(
@@ -938,33 +931,6 @@ export class Effects {
                 })
               );
             }
-          } else {
-            // not opened room :: unread count increased
-            if (
-              action.SVC_TYPE === SVC_TYPE_EVENT &&
-              action.SSVC_TYPE === SSVC_TYPE_EVENT_SEND_RES
-            ) {
-              /**
-               * 다른 디바이스에서 대화를 송신 할경우 RES 가 noti 로 유입될 수 있다.
-               * 이때 unread count 를 중가하지 않는다.
-               */
-            } else {
-              if (
-                !!trgtRoomInfos &&
-                !!trgtRoomInfos[action.roomSeq] &&
-                action.info.type !== EventType.Join &&
-                action.info.type !== EventType.Exit &&
-                action.info.type !== EventType.ForcedExit
-              ) {
-                const noReadCnt = trgtRoomInfos[action.roomSeq].noReadCnt;
-                this.store.dispatch(
-                  SyncStore.updateUnreadCount({
-                    roomSeq: action.roomSeq,
-                    noReadCnt: noReadCnt + 1
-                  })
-                );
-              }
-            }
           }
 
           // 대화 > 리스트 :: finalEventMessage refresh