diff --git a/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-add.ts b/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-add.ts
new file mode 100644
index 00000000..64416f74
--- /dev/null
+++ b/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-add.ts
@@ -0,0 +1,41 @@
+import { DeviceType, LocaleCode } from '@ucap-webmessenger/core';
+import {
+  ProtocolRequest,
+  ProtocolResponse,
+  ProtocolEncoder,
+  PacketBody,
+  PacketBodyValue,
+  ProtocolDecoder,
+  ProtocolMessage
+} from '@ucap-webmessenger/protocol';
+
+export interface BuddyAddRequest extends ProtocolRequest {
+  // 0n. 사용자SEQ(n)...
+  userSeqs: number[];
+}
+
+export interface BuddyAddResponse extends ProtocolResponse {
+  // 0n. 사용자SEQ(n)...
+  userSeqs: number[];
+}
+
+export const encodeBuddyAdd: ProtocolEncoder<BuddyAddRequest> = (
+  req: BuddyAddRequest
+) => {
+  const bodyList: PacketBody[] = [];
+
+  for (const userSeq of req.userSeqs) {
+    bodyList.push({ type: PacketBodyValue.Integer, value: userSeq });
+  }
+
+  return bodyList;
+};
+
+export const decodeBuddyAdd: ProtocolDecoder<BuddyAddResponse> = (
+  message: ProtocolMessage
+) => {
+  const userSeqArray: number[] = [...message.bodyList];
+  return {
+    userSeqs: userSeqArray
+  } as BuddyAddResponse;
+};
diff --git a/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-del.ts b/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-del.ts
new file mode 100644
index 00000000..d0860eef
--- /dev/null
+++ b/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-del.ts
@@ -0,0 +1,41 @@
+import { DeviceType, LocaleCode } from '@ucap-webmessenger/core';
+import {
+  ProtocolRequest,
+  ProtocolResponse,
+  ProtocolEncoder,
+  PacketBody,
+  PacketBodyValue,
+  ProtocolDecoder,
+  ProtocolMessage
+} from '@ucap-webmessenger/protocol';
+
+export interface BuddyDelRequest extends ProtocolRequest {
+  // 0n. 사용자SEQ(n)...
+  userSeqs: number[];
+}
+
+export interface BuddyDelResponse extends ProtocolResponse {
+  // 0n. 사용자SEQ(n)...
+  userSeqs: number[];
+}
+
+export const encodeBuddyDel: ProtocolEncoder<BuddyDelRequest> = (
+  req: BuddyDelRequest
+) => {
+  const bodyList: PacketBody[] = [];
+
+  for (const userSeq of req.userSeqs) {
+    bodyList.push({ type: PacketBodyValue.Integer, value: userSeq });
+  }
+
+  return bodyList;
+};
+
+export const decodeBuddyDel: ProtocolDecoder<BuddyDelResponse> = (
+  message: ProtocolMessage
+) => {
+  const userSeqArray: number[] = [...message.bodyList];
+  return {
+    userSeqs: userSeqArray
+  } as BuddyDelResponse;
+};
diff --git a/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-update.ts b/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-update.ts
new file mode 100644
index 00000000..395362a6
--- /dev/null
+++ b/projects/ucap-webmessenger-protocol-buddy/src/lib/models/buddy-update.ts
@@ -0,0 +1,47 @@
+import { DeviceType, LocaleCode } from '@ucap-webmessenger/core';
+import {
+  ProtocolRequest,
+  ProtocolResponse,
+  ProtocolEncoder,
+  PacketBody,
+  PacketBodyValue,
+  ProtocolDecoder,
+  ProtocolMessage
+} from '@ucap-webmessenger/protocol';
+
+export interface BuddyUpdateRequest extends ProtocolRequest {
+  // 0. 사용자SEQ(n)
+  userSeq: number;
+  // 1. 즐겨찾기여부(y)
+  favorit: boolean;
+}
+
+export interface BuddyUpdateResponse extends ProtocolResponse {
+  // 0. 사용자SEQ(n)
+  userSeq: number;
+  // 1. 즐겨찾기여부(y)
+  favorit: boolean;
+}
+
+export const encodeBuddyUpdate: ProtocolEncoder<BuddyUpdateRequest> = (
+  req: BuddyUpdateRequest
+) => {
+  const bodyList: PacketBody[] = [];
+
+  bodyList.push({ type: PacketBodyValue.Integer, value: req.userSeq });
+  bodyList.push({
+    type: PacketBodyValue.String,
+    value: req.favorit ? 'Y' : 'N'
+  });
+
+  return bodyList;
+};
+
+export const decodeBuddyUpdate: ProtocolDecoder<BuddyUpdateResponse> = (
+  message: ProtocolMessage
+) => {
+  return {
+    userSeq: message.bodyList[0],
+    favorit: message.bodyList[1] === 'Y' ? true : false
+  } as BuddyUpdateResponse;
+};
diff --git a/projects/ucap-webmessenger-protocol-buddy/src/lib/services/buddy-protocol.service.ts b/projects/ucap-webmessenger-protocol-buddy/src/lib/services/buddy-protocol.service.ts
index 2a0682d9..0816eb01 100644
--- a/projects/ucap-webmessenger-protocol-buddy/src/lib/services/buddy-protocol.service.ts
+++ b/projects/ucap-webmessenger-protocol-buddy/src/lib/services/buddy-protocol.service.ts
@@ -1,8 +1,54 @@
 import { Injectable } from '@angular/core';
 
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+
+import { ProtocolService } from '@ucap-webmessenger/protocol';
+
+import {
+  SVC_TYPE_BUDDY,
+  SSVC_TYPE_BUDDY_ADD_REQ,
+  SSVC_TYPE_BUDDY_DEL_REQ,
+  SSVC_TYPE_BUDDY_UPD_REQ
+} from '../types/service';
+
+import {
+  BuddyAddRequest,
+  encodeBuddyAdd,
+  decodeBuddyAdd
+} from '../models/buddy-add';
+import {
+  BuddyDelRequest,
+  encodeBuddyDel,
+  decodeBuddyDel
+} from '../models/buddy-del';
+import {
+  BuddyUpdateRequest,
+  decodeBuddyUpdate,
+  encodeBuddyUpdate
+} from '../models/buddy-update';
+
 @Injectable({
   providedIn: 'root'
 })
 export class BuddyProtocolService {
-  constructor() {}
+  constructor(private protocolService: ProtocolService) {}
+
+  public buddyAdd(req: BuddyAddRequest): Observable<BuddyAddRequest> {
+    return this.protocolService
+      .call(SVC_TYPE_BUDDY, SSVC_TYPE_BUDDY_ADD_REQ, ...encodeBuddyAdd(req))
+      .pipe(map(res => decodeBuddyAdd(res)));
+  }
+
+  public buddyDel(req: BuddyDelRequest): Observable<BuddyDelRequest> {
+    return this.protocolService
+      .call(SVC_TYPE_BUDDY, SSVC_TYPE_BUDDY_DEL_REQ, ...encodeBuddyDel(req))
+      .pipe(map(res => decodeBuddyDel(res)));
+  }
+
+  public buddyUpdate(req: BuddyUpdateRequest): Observable<BuddyUpdateRequest> {
+    return this.protocolService
+      .call(SVC_TYPE_BUDDY, SSVC_TYPE_BUDDY_UPD_REQ, ...encodeBuddyUpdate(req))
+      .pipe(map(res => decodeBuddyUpdate(res)));
+  }
 }
diff --git a/projects/ucap-webmessenger-protocol-buddy/src/lib/types/service.ts b/projects/ucap-webmessenger-protocol-buddy/src/lib/types/service.ts
new file mode 100644
index 00000000..2574056b
--- /dev/null
+++ b/projects/ucap-webmessenger-protocol-buddy/src/lib/types/service.ts
@@ -0,0 +1,7 @@
+export const SVC_TYPE_BUDDY = 4; // 동료 관리
+export const SSVC_TYPE_BUDDY_ADD_REQ = 1; // 동료추가
+export const SSVC_TYPE_BUDDY_ADD_RES = 2;
+export const SSVC_TYPE_BUDDY_DEL_REQ = 11; // 동료삭제
+export const SSVC_TYPE_BUDDY_DEL_RES = 12;
+export const SSVC_TYPE_BUDDY_UPD_REQ = 21; // 동료변경
+export const SSVC_TYPE_BUDDY_UPD_RES = 22;