diff --git a/projects/ucap-webmessenger-api-message/src/lib/apis/edit-reservation-ex.ts b/projects/ucap-webmessenger-api-message/src/lib/apis/edit-reservation-ex.ts
index a18a4bb0..70bfe827 100644
--- a/projects/ucap-webmessenger-api-message/src/lib/apis/edit-reservation-ex.ts
+++ b/projects/ucap-webmessenger-api-message/src/lib/apis/edit-reservation-ex.ts
@@ -2,7 +2,10 @@ import {
   APIRequest,
   MessageAPIResponse,
   APIJsonEncoder,
-  APIDecoder
+  APIDecoder,
+  FileUploadItem,
+  ParameterUtil,
+  APIFormDataEncoder
 } from '@ucap-webmessenger/api';
 import { DeviceType } from '@ucap-webmessenger/core';
 import { CategoryType } from '../types/category.type';
@@ -17,19 +20,69 @@ export interface EditReservationRequest extends APIRequest {
   title: string;
   titleYn: boolean;
   listOrder: ContentType[];
+  resSeqList: number[];
   reservationTime: string;
-  smsYn: boolean;
+  smsYn?: boolean;
 
   textContent: { text: string }[];
   recvUserList: { userSeq: number; userName: string }[];
+
+  files?: File[];
+  fileUploadItem?: FileUploadItem;
 }
 
 export interface EditReservationResponse extends MessageAPIResponse {}
 
-export const encodeEditReservation: APIJsonEncoder<EditReservationRequest> = (
+const editReservationEncodeMap = {
+  userSeq: 'userSeq',
+  deviceType: 'deviceType',
+  tokenKey: 'tokenKey',
+  msgId: 'msgId',
+  category: 'category',
+  title: 'title',
+  titleYn: 'titleYn',
+  listOrder: 'listOrder',
+  resSeqList: 'resSeqList',
+  reservationTime: 'reservationTime',
+  smsYn: 'smsYn',
+  textContent: 'textContent',
+  recvUserList: 'recvUserList',
+  files: 'files'
+};
+
+export const encodeEditReservation: APIFormDataEncoder<EditReservationRequest> = (
   req: EditReservationRequest
 ) => {
-  return JSON.stringify(req);
+  const extraParams: any = {};
+
+  extraParams.userSeq = String(req.userSeq);
+  if (!!req.titleYn) {
+    extraParams.titleYn = req.titleYn ? 'Y' : 'N';
+  }
+  if (!!req.smsYn) {
+    extraParams.smsYn = req.smsYn ? 'Y' : 'N';
+  }
+  if (!!req.listOrder) {
+    let s = '';
+    req.listOrder.forEach(v => {
+      s = s + String(v);
+    });
+    extraParams.listOrder = s;
+  }
+  if (!!req.resSeqList) {
+    extraParams.resSeqList = req.resSeqList.map(v => v.toString()).join(',');
+  }
+  if (!!req.textContent) {
+    extraParams.textContent = JSON.stringify(req.textContent);
+  }
+  if (!!req.recvUserList) {
+    extraParams.recvUserList = JSON.stringify(req.recvUserList);
+  }
+  return ParameterUtil.encodeFormData(
+    editReservationEncodeMap,
+    req,
+    extraParams
+  );
 };
 
 export const decodeEditReservation: APIDecoder<EditReservationResponse> = (
diff --git a/projects/ucap-webmessenger-api-message/src/lib/services/message-api.service.ts b/projects/ucap-webmessenger-api-message/src/lib/services/message-api.service.ts
index 0521c6aa..7f0be966 100644
--- a/projects/ucap-webmessenger-api-message/src/lib/services/message-api.service.ts
+++ b/projects/ucap-webmessenger-api-message/src/lib/services/message-api.service.ts
@@ -188,6 +188,34 @@ export class MessageApiService {
       })
     );
   }
+  /** edit reservation */
+  public editReservationMessageEx(
+    req: EditReservationRequest
+  ): Observable<EditReservationResponse> {
+    const httpReq = new HttpRequest(
+      'POST',
+      this.urls.editReservationMessageEx,
+      encodeEditReservation(req),
+      { reportProgress: true, responseType: 'text' as 'json' }
+    );
+
+    const progress = req.fileUploadItem.uploadStart();
+
+    return this.httpClient.request(httpReq).pipe(
+      filter(event => {
+        if (event instanceof HttpResponse) {
+          return true;
+        } else if (HttpEventType.UploadProgress === event.type) {
+          progress.next(Math.round((100 * event.loaded) / event.total));
+        }
+        return false;
+      }),
+      map((event: HttpResponse<any>) => {
+        req.fileUploadItem.uploadComplete();
+        return decodeSend(event.body);
+      })
+    );
+  }
 
   /** detail */
   public detailMessage(req: DetailRequest): Observable<DetailResponse> {
@@ -299,21 +327,6 @@ export class MessageApiService {
       .pipe(map(res => decodeEditMy(res)));
   }
 
-  /** edit reservation */
-  public editReservationMessageEx(
-    req: EditReservationRequest
-  ): Observable<EditReservationResponse> {
-    return this.httpClient
-      .post<any>(
-        this.urls.editReservationMessageEx,
-        encodeEditReservation(req),
-        {
-          headers: this.headers
-        }
-      )
-      .pipe(map(res => decodeEditReservation(res)));
-  }
-
   /** send-copy(forward) */
   public sendCopyMessage(req: SendCopyRequest): Observable<SendCopyResponse> {
     return this.httpClient
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.html
index d380db62..247261f0 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.html
@@ -199,6 +199,7 @@
       style="display: none;"
     >
       <app-layout-chat-left-sidenav-message
+        #messageBoxComponent
         [isVisible]="currentTabLable === MainMenu.Message"
         (doRefreshUnReadCount)="getMessageUnreadCount()"
       ></app-layout-chat-left-sidenav-message>
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 b031b7af..a2256384 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
@@ -7,7 +7,8 @@ import {
   ViewChildren,
   QueryList,
   ElementRef,
-  OnDestroy
+  OnDestroy,
+  ViewChild
 } from '@angular/core';
 import { NGXLogger } from 'ngx-logger';
 import { ucapAnimations, DialogService } from '@ucap-webmessenger/ui';
@@ -34,7 +35,7 @@ import { SessionStorageService } from '@ucap-webmessenger/web-storage';
 import { KEY_LOGIN_RES_INFO } from '@app/types/login-res-info.type';
 import { VersionInfo2Response } from '@ucap-webmessenger/api-public';
 import { KEY_VER_INFO } from '@app/types/ver-info.type';
-import { MessageApiService } from '@ucap-webmessenger/api-message';
+import { MessageApiService, MessageType } from '@ucap-webmessenger/api-message';
 import { DeviceType } from '@ucap-webmessenger/core';
 import { UnreadCountRequest } from 'projects/ucap-webmessenger-api-message/src/lib/apis/unread-count';
 import { map, catchError, tap } from 'rxjs/operators';
@@ -45,6 +46,7 @@ import {
   MessageWriteDialogData
 } from '../dialogs/message/message-write.dialog.component';
 import { EnvironmentsInfo, KEY_ENVIRONMENTS_INFO } from '@app/types';
+import { MessageBoxComponent } from './left-sidenav/message.component';
 
 export enum MainMenu {
   Group = 'GROUP',
@@ -70,6 +72,9 @@ export class LeftSideComponent implements OnInit, OnDestroy {
   @ViewChildren('tabs') tabs: QueryList<ElementRef<HTMLDivElement>>;
   currentTabLable: string;
 
+  @ViewChild('messageBoxComponent', { static: false })
+  messageBoxComponent: MessageBoxComponent;
+
   badgeChatUnReadCount: number;
   badgeChatUnReadCountSubscription: Subscription;
   badgeMessageUnReadCount: number;
@@ -229,20 +234,24 @@ export class LeftSideComponent implements OnInit, OnDestroy {
       }
     });
 
-    // if (!!result && !!result.choice && result.choice) {
-    //   if (!!result.selectedUserList && result.selectedUserList.length > 0) {
-    //     const userSeqs: number[] = [];
-    //     result.selectedUserList.map(user => userSeqs.push(user.seq));
-
-    //     if (type === 'NORMAL') {
-    //       this.store.dispatch(ChatStore.openRoom({ userSeqList: userSeqs }));
-    //     } else if (type === 'TIMER') {
-    //       this.store.dispatch(
-    //         ChatStore.openRoom({ userSeqList: userSeqs, isTimeRoom: true })
-    //       );
-    //     }
-    //   }
-    // }
+    if (!!result && !!result.sendFlag && result.sendFlag) {
+      if (
+        this.currentTabLable === MainMenu.Message &&
+        !!this.messageBoxComponent
+      ) {
+        const type = result.sendType || MessageType.Send;
+        switch (type) {
+          case MessageType.Send:
+            this.messageBoxComponent.onSelectedIndexChange(1);
+            this.messageBoxComponent.onSelectedIndexTab(1);
+            break;
+          case MessageType.Reservation:
+            this.messageBoxComponent.onSelectedIndexChange(2);
+            this.messageBoxComponent.onSelectedIndexTab(2);
+            break;
+        }
+      }
+    }
   }
 
   onClickOpenProfile(userInfo: UserInfo | UserInfoSS | UserInfoF | UserInfoDN) {
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/message.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/message.component.ts
index 2f51dfcd..e035ce41 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/message.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/message.component.ts
@@ -154,6 +154,9 @@ export class MessageBoxComponent
     }
   }
 
+  onSelectedIndexTab(value: number) {
+    this.tabs.selectedIndex = value;
+  }
   onSelectedIndexChange(value: number) {
     this.currentTabIndex = value;
     let type: MessageType;
@@ -377,6 +380,10 @@ export class MessageBoxComponent
                   // 단건 발송취소(예약)
                   this.doMessageCancelReservation(result.messageInfo);
                   break;
+                case 'UPDATE':
+                  // 예약 수정
+                  this.getRetrieveMessage(MessageType.Reservation, 0);
+                  break;
               }
             }
           } else {
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-detail.dialog.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-detail.dialog.component.html
index 5b99d12d..c073949b 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-detail.dialog.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-detail.dialog.component.html
@@ -42,11 +42,27 @@
               <span>{{ getSendReceiverNames() }}</span>
             </li>
             <li>
-              <span class="label">받은시간</span>
-              <span>{{
+              <span
+                *ngIf="messageInfo.type === MessageType.Receive"
+                class="label"
+                >받은시간</span
+              >
+              <span *ngIf="messageInfo.type === MessageType.Send" class="label"
+                >보낸시간</span
+              >
+              <span
+                *ngIf="messageInfo.type === MessageType.Reservation"
+                class="label"
+                >발송예정시간</span
+              >
+              <span *ngIf="messageInfo.type !== MessageType.Reservation">{{
                 messageInfo.regDate
                   | dateToStringFormat: 'YYYY.MM.dd (KS) a/p HH:mm'
               }}</span>
+              <span *ngIf="messageInfo.type === MessageType.Reservation">{{
+                messageInfo.reservationTime
+                  | dateToStringFormat: 'YYYY.MM.dd (KS) a/p HH:mm'
+              }}</span>
             </li>
           </ul>
         </div>
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-detail.dialog.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-detail.dialog.component.ts
index e48b15cd..f0a0c4b1 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-detail.dialog.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-detail.dialog.component.ts
@@ -180,6 +180,32 @@ export class MessageDetailDialogComponent implements OnInit {
       }
     });
   }
+  getBaseImage(): void {
+    this.contents.forEach(content => {
+      if (content.resType === ContentType.Image) {
+        this.messageApiService
+          .retrieveResourceFile({
+            userSeq: this.data.loginRes.userSeq,
+            deviceType: DeviceType.PC,
+            tokenKey: this.data.loginRes.tokenString,
+            type: this.messageInfo.type,
+            msgId: this.messageInfo.msgId,
+            resUrl: content.resUrl
+          } as RetrieveResourceFileRequest)
+          .pipe(
+            take(1),
+            map(async rawBlob => {
+              const reader = new FileReader();
+              reader.readAsDataURL(rawBlob);
+              reader.onloadend = () => {
+                content.imageSrc = reader.result;
+              };
+            })
+          )
+          .subscribe();
+      }
+    });
+  }
 
   // /**
   //  * @deprecated
@@ -442,7 +468,7 @@ export class MessageDetailDialogComponent implements OnInit {
         break;
       case 'MESSAGE_UPDATE':
         {
-          this.dialogService.open<
+          const result = await this.dialogService.open<
             MessageWriteDialogComponent,
             MessageWriteDialogData,
             MessageWriteDialogResult
@@ -454,14 +480,38 @@ export class MessageDetailDialogComponent implements OnInit {
             data: {
               loginRes: this.data.loginRes,
               environmentsInfo: this.data.environmentsInfo,
-              detail: this.data.detail
+              detail: this.data.detail,
+              detailContents: this.convertContentsToEdit()
             }
           });
+
+          if (!!result && !!result.sendFlag && result.sendFlag) {
+            this.dialogRef.close({
+              returnType: 'UPDATE'
+            });
+          }
         }
         break;
     }
   }
 
+  /** 기존 내용을 editor 에 맞게 컨버팅 한다. */
+  private convertContentsToEdit(): string {
+    // const contents: DetailContent[] = this.data.detail.contents;
+    const contents = this.contents;
+    let html = '';
+    contents.forEach(content => {
+      if (content.resType === ContentType.Text) {
+        html += content.resContent.replace(/\n/g, '<br/>');
+      } else if (content.resType === ContentType.Image) {
+        html += `<img id="${content.resSeq}" src="${content.imageSrc}" >`;
+      } else if (content.resType === ContentType.AttachFile) {
+      }
+      html += '<br/>';
+    });
+    return html;
+  }
+
   async cancelSendMessageForUsers() {
     if (
       !!this.unReadUsers &&
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.html
index 094b2b52..2456ffbc 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.html
@@ -1,13 +1,13 @@
 <mat-card class="confirm-card mat-elevation-z">
   <mat-card-header>
-    <mat-card-title>
-      쪽지 보내기
-    </mat-card-title>
+    <mat-card-title> 쪽지 {{ isModify ? '수정' : '보내기' }} </mat-card-title>
   </mat-card-header>
   <mat-card-content>
     <ucap-message-write
       #messageWrite
+      [isModify]="isModify"
       [detail]="data.detail"
+      [detailContents]="data.detailContents"
       [curReceiverList]="data.receiverList"
       (send)="onSend($event)"
       (selectReceiver)="onSelectReceiver($event)"
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.ts
index fd647277..070788f3 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.ts
@@ -7,7 +7,8 @@ import {
   DetailResponse,
   DetailContent,
   MessageApiService,
-  DetailReceiver
+  DetailReceiver,
+  MessageType
 } from '@ucap-webmessenger/api-message';
 
 import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
@@ -15,7 +16,8 @@ import { NGXLogger } from 'ngx-logger';
 import { MessageStatusCode } from '@ucap-webmessenger/api';
 import {
   WriteComponent as UCapMessageWriteComponent,
-  Message
+  Message,
+  MessageModify
 } from '@ucap-webmessenger/ui-message';
 import { UserInfo } from '@ucap-webmessenger/protocol-sync';
 import {
@@ -30,11 +32,15 @@ export interface MessageWriteDialogData {
   loginRes: LoginResponse;
   environmentsInfo: EnvironmentsInfo;
   detail?: DetailResponse;
+  detailContents?: string;
   receiverList?: UserInfo[];
 }
 
 // tslint:disable-next-line: no-empty-interface
-export interface MessageWriteDialogResult {}
+export interface MessageWriteDialogResult {
+  sendFlag: boolean;
+  sendType?: MessageType;
+}
 
 export interface DownloadQueueForMessage extends DetailContent {
   downloadType: string;
@@ -49,6 +55,8 @@ export class MessageWriteDialogComponent implements OnInit {
   @ViewChild('messageWrite', { static: true })
   messageWrite: UCapMessageWriteComponent;
 
+  isModify = false;
+
   constructor(
     public dialogRef: MatDialogRef<
       MessageWriteDialogData,
@@ -61,7 +69,11 @@ export class MessageWriteDialogComponent implements OnInit {
     private dialogService: DialogService
   ) {}
 
-  ngOnInit(): void {}
+  ngOnInit(): void {
+    if (!!this.data.detail && !!this.data.detail.msgInfo) {
+      this.isModify = true;
+    }
+  }
 
   async onSelectReceiver(receiverList: UserInfo[]) {
     const result = await this.dialogService.open<
@@ -87,7 +99,14 @@ export class MessageWriteDialogComponent implements OnInit {
     }
   }
 
-  onSend(message: Message) {
+  onSend(message: Message | MessageModify) {
+    if (this.isModify) {
+      this.onModifySend(message as MessageModify);
+    } else {
+      this.onNewSend(message as Message);
+    }
+  }
+  onNewSend(message: Message) {
     this.messageApiService
       .sendMessage({
         ...message,
@@ -112,7 +131,7 @@ export class MessageWriteDialogComponent implements OnInit {
             verticalPosition: 'bottom'
           });
 
-          this.dialogRef.close({});
+          this.dialogRef.close({ sendFlag: true, sendType: message.type });
         },
         error => {
           this.snackBarService.open(`쪽지를 전송에 실패 하였습니다.`, '', {
@@ -123,9 +142,37 @@ export class MessageWriteDialogComponent implements OnInit {
         }
       );
   }
+  onModifySend(message: MessageModify) {
+    this.messageApiService
+      .editReservationMessageEx({
+        ...message,
+        userSeq: this.data.loginRes.userInfo.seq,
+        deviceType: this.data.environmentsInfo.deviceType,
+        tokenKey: this.data.loginRes.tokenString,
+        titleYn: '' !== message.title ? true : false
+      })
+      .pipe(take(1))
+      .subscribe(
+        res => {
+          this.snackBarService.open('쪽지를 수정하였습니다.', '', {
+            duration: 3000,
+            verticalPosition: 'bottom'
+          });
+
+          this.dialogRef.close({ sendFlag: true, sendType: message.type });
+        },
+        error => {
+          this.snackBarService.open(`쪽지 수정에 실패 하였습니다.`, '', {
+            duration: 3000,
+            verticalPosition: 'bottom'
+          });
+          // this.dialogRef.close({});
+        }
+      );
+  }
 
   onCancel() {
-    this.dialogRef.close({});
+    this.dialogRef.close({ sendFlag: false });
   }
 
   getBtnValid() {
diff --git a/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.html b/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.html
index 183bd930..0a48def7 100644
--- a/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.html
+++ b/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.html
@@ -14,6 +14,16 @@
       ></div>
       <input type="file" #fileInput style="display: none" multiple />
       <mat-list>
+        <mat-list-item *ngFor="let oldAttachment of oldAttachmentList">
+          {{ oldAttachment.resContent }}
+          <button
+            mat-button
+            aria-label="이미지삭제"
+            (click)="onClickDeleteOldAttachment(oldAttachment)"
+          >
+            <span class="mdi mdi-delete"></span>
+          </button>
+        </mat-list-item>
         <mat-list-item *ngFor="let attachment of attachmentList">
           {{ attachment.name }}
         </mat-list-item>
@@ -80,6 +90,7 @@
         </mat-menu>
 
         <ucap-split-button
+          *ngIf="!isModify"
           [menu]="appMenu"
           (buttonClick)="onClickSend()"
           [disabled]="
@@ -91,6 +102,21 @@
           "
           >보내기</ucap-split-button
         >
+        <button
+          *ngIf="isModify"
+          mat-stroked-button
+          (click)="onClickSendSchedule()"
+          [disabled]="
+            messageWriteForm.invalid ||
+            !receiverList ||
+            0 === receiverList.length ||
+            0 === contentLength ||
+            1000 < contentLength
+          "
+          class="mat-primary"
+        >
+          예약 보내기
+        </button>
       </div>
     </mat-card-actions>
   </form>
diff --git a/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.ts b/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.ts
index f06043bf..3b2910b2 100644
--- a/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.ts
+++ b/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.ts
@@ -24,7 +24,8 @@ import {
   CategoryType,
   MessageType,
   DetailResponse,
-  DetailReceiver
+  DetailReceiver,
+  DetailContent
 } from '@ucap-webmessenger/api-message';
 import { FileUploadItem } from '@ucap-webmessenger/api';
 import { UserInfo } from '@ucap-webmessenger/protocol-sync';
@@ -35,12 +36,14 @@ import {
 } from '../dialogs/schedule-send.dialog.component';
 import { RoleCode } from '@ucap-webmessenger/protocol-authentication';
 import { EmployeeType } from '@ucap-webmessenger/protocol-room';
+import { contentTracing } from 'electron';
 
 const ATTR_FILE = 'UCAP_ATTR_FILE';
 
 interface Content {
   contentType: ContentType;
   content: string | File;
+  resSeq: number;
 }
 
 export interface Message {
@@ -55,6 +58,11 @@ export interface Message {
   reservationTime?: string;
   smsYn?: boolean;
 }
+export interface MessageModify extends Message {
+  resSeqList: number[];
+  reservationTime: string;
+  msgId: number;
+}
 
 @Component({
   selector: 'ucap-message-write',
@@ -67,9 +75,13 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
   curReceiverList: UserInfo[] = [];
   @Input()
   detail?: DetailResponse;
+  @Input()
+  detailContents?: string;
+  @Input()
+  isModify = false;
 
   @Output()
-  send = new EventEmitter<Message>();
+  send = new EventEmitter<Message | MessageModify>();
 
   @Output()
   cancel = new EventEmitter<void>();
@@ -84,13 +96,12 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
   fileInput: ElementRef<HTMLInputElement>;
 
   messageWriteForm: FormGroup;
+  oldAttachmentList: DetailContent[] = [];
   attachmentList: File[];
   fileUploadItem: FileUploadItem;
   receiverList: UserInfo[] = [];
   contentLength = 0;
 
-  isModify = false;
-
   constructor(
     private formBuilder: FormBuilder,
     private dialogService: DialogService,
@@ -111,17 +122,21 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
       );
     }
 
-    if (!!this.detail && !!this.detail.msgInfo) {
-      this.isModify = true;
-
+    if (this.isModify) {
       if (!!this.detail.msgInfo.title) {
         this.messageWriteForm.setValue({ title: this.detail.msgInfo.title });
       }
 
-      if (!!this.detail.contents && this.detail.contents.length > 0) {
-        // 내용이 있다.
-        this.detail.contents.map(cont => console.log(cont));
+      if (!!this.detailContents) {
+        this.editor.nativeElement.innerHTML = this.detailContents;
+        this.onInputEditor();
       }
+
+      this.detail.contents.forEach(content => {
+        if (content.resType === ContentType.AttachFile) {
+          this.oldAttachmentList.push(content);
+        }
+      });
     }
   }
 
@@ -129,6 +144,12 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
 
   ngAfterViewInit(): void {}
 
+  onClickDeleteOldAttachment(oldAttachment: DetailContent) {
+    this.oldAttachmentList = this.oldAttachmentList.filter(
+      detailContent => detailContent.resSeq !== oldAttachment.resSeq
+    );
+  }
+
   onClickImage() {
     this.fileInput.nativeElement.click();
     const self = this;
@@ -206,6 +227,10 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
   }
 
   async onClickSendSchedule() {
+    const reservationDate = this.isModify
+      ? moment(this.detail.msgInfo.reservationTime)
+      : undefined;
+
     const result = await this.dialogService.open<
       ScheduleSendDialogComponent,
       ScheduleSendDialogData,
@@ -214,7 +239,9 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
       width: '600px',
       height: '600px',
       disableClose: true,
-      data: {}
+      data: {
+        reservationDate
+      }
     });
 
     if (!!result && !!result.scheduleSendDate) {
@@ -247,7 +274,7 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
       return;
     }
 
-    const { listOrder, textContent, files } = result;
+    const { listOrder, textContent, files, resSeqList } = result;
 
     if (!listOrder || 0 === listOrder.length) {
       return;
@@ -265,19 +292,39 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
 
     this.fileUploadItem = FileUploadItem.from();
 
-    this.send.emit({
-      category: CategoryType.General,
-      type: !!reservationDate ? MessageType.Reservation : MessageType.Send,
-      title,
-      listOrder,
-      textContent,
-      recvUserList,
-      reservationTime: !!reservationDate
-        ? `${reservationDate.format('YYYY-MM-DD HH:mm')}:00`
-        : undefined,
-      files,
-      fileUploadItem: this.fileUploadItem
-    });
+    if (!this.isModify) {
+      const message: Message = {
+        category: CategoryType.General,
+        type: !!reservationDate ? MessageType.Reservation : MessageType.Send,
+        title,
+        listOrder,
+        textContent,
+        recvUserList,
+        reservationTime: !!reservationDate
+          ? `${reservationDate.format('YYYY-MM-DD HH:mm')}:00`
+          : undefined,
+        files,
+        fileUploadItem: this.fileUploadItem
+      };
+      this.send.emit(message);
+    } else {
+      const message: MessageModify = {
+        category: CategoryType.General,
+        type: !!reservationDate ? MessageType.Reservation : MessageType.Send,
+        msgId: this.detail.msgInfo.msgId,
+        title,
+        listOrder,
+        resSeqList,
+        textContent,
+        recvUserList,
+        reservationTime: !!reservationDate
+          ? `${reservationDate.format('YYYY-MM-DD HH:mm')}:00`
+          : undefined,
+        files,
+        fileUploadItem: this.fileUploadItem
+      };
+      this.send.emit(message);
+    }
   }
 
   private parseContent():
@@ -285,6 +332,7 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
         listOrder: ContentType[];
         textContent: { text: string }[];
         files: File[];
+        resSeqList: number[];
       }
     | undefined {
     const contentList: Content[] = this.generateContent();
@@ -295,20 +343,26 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
     const listOrder: ContentType[] = [];
     const textContent: { text: string }[] = [];
     const files: File[] = [];
+    const resSeqList: number[] = [];
 
     contentList.forEach(v => {
       listOrder.push(v.contentType);
+      resSeqList.push(v.resSeq);
       switch (v.contentType) {
         case ContentType.Text:
           let content = v.content as string;
           if ('\n' === content.charAt(content.length - 1)) {
-            content = content.substring(0, content.length - 2);
+            content = content.substring(0, content.length - 1);
           }
           textContent.push({ text: content });
           break;
         case ContentType.Image:
         case ContentType.AttachFile:
-          files.push(v.content as File);
+          {
+            if (v.resSeq === 0) {
+              files.push(v.content as File);
+            }
+          }
           break;
         default:
           break;
@@ -318,7 +372,8 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
     return {
       listOrder,
       textContent,
-      files
+      files,
+      resSeqList
     };
   }
 
@@ -329,11 +384,22 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
       this.parseNode(contentList, v);
     });
 
+    if (!!this.oldAttachmentList && 0 < this.oldAttachmentList.length) {
+      this.oldAttachmentList.forEach(v => {
+        contentList.push({
+          contentType: ContentType.AttachFile,
+          content: v.resContent,
+          resSeq: v.resSeq
+        });
+      });
+    }
+
     if (!!this.attachmentList && 0 < this.attachmentList.length) {
       this.attachmentList.forEach(v => {
         contentList.push({
           contentType: ContentType.AttachFile,
-          content: v
+          content: v,
+          resSeq: 0
         });
       });
     }
@@ -362,7 +428,12 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
           } else {
             if ('IMG' === node.nodeName) {
               const img: HTMLImageElement = node as HTMLImageElement;
-              this.appendNode(contentList, ContentType.Image, img[ATTR_FILE]);
+              this.appendNode(
+                contentList,
+                ContentType.Image,
+                img[ATTR_FILE],
+                !!img.getAttribute('id') ? Number(img.getAttribute('id')) : 0
+              );
             } else if ('BR' === node.nodeName) {
               this.appendNode(contentList, ContentType.Text, `\n`);
             } else {
@@ -382,7 +453,8 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
   private appendNode(
     contentList: Content[],
     contentType: ContentType,
-    content: string | File
+    content: string | File,
+    resSeq: number = 0
   ) {
     const prevContent = contentList[contentList.length - 1];
     switch (contentType) {
@@ -392,12 +464,13 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
         } else {
           contentList.push({
             contentType: ContentType.Text,
-            content
+            content,
+            resSeq
           });
         }
         break;
       default:
-        contentList.push({ contentType, content });
+        contentList.push({ contentType, content, resSeq });
         break;
     }
   }
diff --git a/projects/ucap-webmessenger-ui-message/src/lib/dialogs/schedule-send.dialog.component.ts b/projects/ucap-webmessenger-ui-message/src/lib/dialogs/schedule-send.dialog.component.ts
index e49d9332..39d15d71 100644
--- a/projects/ucap-webmessenger-ui-message/src/lib/dialogs/schedule-send.dialog.component.ts
+++ b/projects/ucap-webmessenger-ui-message/src/lib/dialogs/schedule-send.dialog.component.ts
@@ -6,7 +6,9 @@ import { FormGroup, FormBuilder, Validators } from '@angular/forms';
 import moment from 'moment';
 
 // tslint:disable-next-line: no-empty-interface
-export interface ScheduleSendDialogData {}
+export interface ScheduleSendDialogData {
+  reservationDate?: moment.Moment;
+}
 
 export interface ScheduleSendDialogResult {
   scheduleSendDate?: moment.Moment;
@@ -48,7 +50,11 @@ export class ScheduleSendDialogComponent implements OnInit {
     private formBuilder: FormBuilder,
     private logger: NGXLogger
   ) {
-    this.selectedDate = moment().add(1, 'hours');
+    if (!!this.data.reservationDate) {
+      this.selectedDate = this.data.reservationDate;
+    } else {
+      this.selectedDate = moment().add(1, 'hours');
+    }
   }
 
   ngOnInit(): void {