diff --git a/apps/backend/apps/admin/src/announcement/announcement.resolver.spec.ts b/apps/backend/apps/admin/src/announcement/announcement.resolver.spec.ts
new file mode 100644
index 0000000000..f885afb384
--- /dev/null
+++ b/apps/backend/apps/admin/src/announcement/announcement.resolver.spec.ts
@@ -0,0 +1,23 @@
+import { Test, type TestingModule } from '@nestjs/testing'
+import { expect } from 'chai'
+import { AnnouncementResolver } from './announcement.resolver'
+import { AnnouncementService } from './announcement.service'
+
+describe('AnnouncementResolver', () => {
+  let resolver: AnnouncementResolver
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        AnnouncementResolver,
+        { provide: AnnouncementService, useValue: {} }
+      ]
+    }).compile()
+
+    resolver = module.get<AnnouncementResolver>(AnnouncementResolver)
+  })
+
+  it('shoulld be defined', () => {
+    expect(resolver).to.be.ok
+  })
+})
diff --git a/apps/backend/apps/admin/src/announcement/announcement.resolver.ts b/apps/backend/apps/admin/src/announcement/announcement.resolver.ts
index 621ae6d86b..390ca650e0 100644
--- a/apps/backend/apps/admin/src/announcement/announcement.resolver.ts
+++ b/apps/backend/apps/admin/src/announcement/announcement.resolver.ts
@@ -1,44 +1,91 @@
+import { InternalServerErrorException, Logger } from '@nestjs/common'
 import { Resolver, Query, Mutation, Args, Int } from '@nestjs/graphql'
-import { Announcement } from '@generated'
+import {
+  DuplicateFoundException,
+  EntityNotExistException
+} from '@libs/exception'
+import { Announcement } from '@admin/@generated'
 import { AnnouncementService } from './announcement.service'
-import { CreateAnnouncementInput } from './dto/create-announcement.input'
-import { UpdateAnnouncementInput } from './dto/update-announcement.input'
+import { AnnouncementInput } from './dto/announcement.input'
 
 @Resolver(() => Announcement)
 export class AnnouncementResolver {
+  private readonly logger = new Logger(AnnouncementResolver.name)
   constructor(private readonly announcementService: AnnouncementService) {}
 
   @Mutation(() => Announcement)
-  createAnnouncement(
+  async createAnnouncement(
     @Args('createAnnouncementInput')
-    createAnnouncementInput: CreateAnnouncementInput
+    announcementInput: AnnouncementInput
   ) {
-    return this.announcementService.create(createAnnouncementInput)
+    try {
+      return await this.announcementService.createAnnouncement(
+        announcementInput
+      )
+    } catch (error) {
+      if (error instanceof DuplicateFoundException || EntityNotExistException) {
+        throw error.convert2HTTPException()
+      }
+      this.logger.error(error)
+      throw new InternalServerErrorException()
+    }
   }
 
-  @Query(() => [Announcement], { name: 'announcement' })
-  findAll() {
-    return this.announcementService.findAll()
+  @Query(() => [Announcement], { name: 'getAnnouncements' })
+  async getAnnouncements(
+    @Args('contestId', { type: () => Int }) contestId: number,
+    @Args('problemId', { type: () => Int, nullable: true }) problemId?: number
+  ) {
+    try {
+      return await this.announcementService.getAnnouncements(
+        contestId,
+        problemId
+      )
+    } catch (error) {
+      this.logger.error(error)
+      throw new InternalServerErrorException()
+    }
   }
 
-  @Query(() => Announcement, { name: 'announcement' })
-  findOne(@Args('id', { type: () => Int }) id: number) {
-    return this.announcementService.findOne(id)
+  @Query(() => Announcement, { name: 'getAnnouncementById' })
+  async getAnnouncementById(@Args('id', { type: () => Int }) id: number) {
+    try {
+      return await this.announcementService.getAnnouncementById(id)
+    } catch (error) {
+      if (error instanceof EntityNotExistException) {
+        throw error.convert2HTTPException()
+      }
+      this.logger.error(error)
+      throw new InternalServerErrorException()
+    }
   }
 
   @Mutation(() => Announcement)
-  updateAnnouncement(
-    @Args('updateAnnouncementInput')
-    updateAnnouncementInput: UpdateAnnouncementInput
+  async updateAnnouncement(
+    @Args('id', { type: () => Int }) id: number,
+    @Args('content', { type: () => String }) content: string
   ) {
-    return this.announcementService.update(
-      updateAnnouncementInput.id,
-      updateAnnouncementInput
-    )
+    try {
+      return await this.announcementService.updateAnnouncement(id, content)
+    } catch (error) {
+      if (error instanceof EntityNotExistException) {
+        throw error.convert2HTTPException()
+      }
+      this.logger.error(error)
+      throw new InternalServerErrorException()
+    }
   }
 
   @Mutation(() => Announcement)
-  removeAnnouncement(@Args('id', { type: () => Int }) id: number) {
-    return this.announcementService.remove(id)
+  async removeAnnouncement(@Args('id', { type: () => Int }) id: number) {
+    try {
+      return await this.announcementService.removeAnnouncement(id)
+    } catch (error) {
+      if (error instanceof EntityNotExistException) {
+        throw error.convert2HTTPException()
+      }
+      this.logger.error(error)
+      throw new InternalServerErrorException()
+    }
   }
 }
diff --git a/apps/backend/apps/admin/src/announcement/announcement.service.spec.ts b/apps/backend/apps/admin/src/announcement/announcement.service.spec.ts
new file mode 100644
index 0000000000..4806b7f3b6
--- /dev/null
+++ b/apps/backend/apps/admin/src/announcement/announcement.service.spec.ts
@@ -0,0 +1,147 @@
+import { Test, type TestingModule } from '@nestjs/testing'
+import { faker } from '@faker-js/faker'
+import { PrismaClientKnownRequestError } from '@prisma/client/runtime/library'
+import { expect } from 'chai'
+import { stub } from 'sinon'
+import {
+  DuplicateFoundException,
+  EntityNotExistException
+} from '@libs/exception'
+import { PrismaService } from '@libs/prisma'
+import { AnnouncementService } from './announcement.service'
+
+const problemId = faker.number.int()
+const contestId = faker.number.int()
+const id = faker.number.int()
+const announcementInput = {
+  problemId,
+  contestId,
+  content: faker.string.sample()
+}
+
+const announcement = {
+  ...announcementInput,
+  id
+}
+
+const contestProblem = {
+  problemId
+}
+
+const db = {
+  announcement: {
+    findFirst: stub(),
+    findFirstOrThrow: stub(),
+    findMany: stub().resolves([announcement]),
+    update: stub(),
+    delete: stub(),
+    create: stub().resolves(announcement)
+  },
+  contestProblem: {
+    findFirst: stub(),
+    findFirstOrThrow: stub()
+  }
+}
+
+const PrismaErrorInstance = new PrismaClientKnownRequestError('error', {
+  code: '4xx',
+  clientVersion: 'x.x.x'
+})
+
+PrismaErrorInstance.name = 'NotFoundError'
+
+describe('AnnouncementService', () => {
+  let service: AnnouncementService
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [AnnouncementService, { provide: PrismaService, useValue: db }]
+    }).compile()
+
+    service = module.get<AnnouncementService>(AnnouncementService)
+  })
+
+  it('should be defined', () => {
+    expect(service).to.be.ok
+  })
+
+  describe('createAnnouncement', () => {
+    it('should return created announcement', async () => {
+      db.announcement.findFirst.resolves(null)
+      db.contestProblem.findFirstOrThrow.resolves(contestProblem)
+
+      const res = await service.createAnnouncement(announcementInput)
+      expect(res).to.deep.equal(announcement)
+    })
+
+    it('should throw error when given announcement already exists', async () => {
+      db.announcement.findFirst.resolves(announcement)
+
+      await expect(
+        service.createAnnouncement(announcementInput)
+      ).to.be.rejectedWith(DuplicateFoundException)
+    })
+
+    it('should throw error when given problemId is invalid', async () => {
+      db.announcement.findFirst.resolves(null)
+      db.contestProblem.findFirstOrThrow.rejects(PrismaErrorInstance)
+
+      await expect(
+        service.createAnnouncement(announcementInput)
+      ).to.be.rejectedWith(EntityNotExistException)
+    })
+  })
+
+  describe('getAnnouncements', () => {
+    it('should return all announcements', async () => {
+      db.announcement.findMany()
+      const res = await service.getAnnouncements(problemId)
+      expect(res).to.deep.equal([announcement])
+    })
+  })
+
+  describe('getAnnouncementById', () => {
+    it('should throw error when given id is invalid', async () => {
+      db.announcement.findFirstOrThrow.rejects(PrismaErrorInstance)
+      await expect(service.getAnnouncementById(id)).to.be.rejectedWith(
+        EntityNotExistException
+      )
+    })
+    it('should return an announcement', async () => {
+      db.announcement.findFirstOrThrow.resolves(announcement)
+      const res = await service.getAnnouncementById(id)
+      expect(res).to.deep.equal(announcement)
+    })
+  })
+
+  describe('updateAnnouncement', () => {
+    it('should return updated announcement', async () => {
+      db.announcement.update.resolves(announcement)
+      const res = await service.updateAnnouncement(
+        id,
+        announcementInput.content
+      )
+      expect(res).to.deep.equal(announcement)
+    })
+    it('should throw error when given id is invalid', async () => {
+      db.announcement.update.rejects(PrismaErrorInstance)
+      await expect(
+        service.updateAnnouncement(id, announcementInput.content)
+      ).to.be.rejectedWith(EntityNotExistException)
+    })
+  })
+
+  describe('removeAnnouncement', () => {
+    it('should return deleted announcement', async () => {
+      db.announcement.delete.resolves(announcement)
+      const res = await service.removeAnnouncement(id)
+      expect(res).to.deep.equal(announcement)
+    })
+    it('should throw error when given id is invalid', async () => {
+      db.announcement.delete.rejects(PrismaErrorInstance)
+      await expect(service.removeAnnouncement(id)).to.be.rejectedWith(
+        EntityNotExistException
+      )
+    })
+  })
+})
diff --git a/apps/backend/apps/admin/src/announcement/announcement.service.ts b/apps/backend/apps/admin/src/announcement/announcement.service.ts
index bf014c9fab..a473509c96 100644
--- a/apps/backend/apps/admin/src/announcement/announcement.service.ts
+++ b/apps/backend/apps/admin/src/announcement/announcement.service.ts
@@ -1,26 +1,102 @@
-import { Injectable } from '@nestjs/common'
-import type { CreateAnnouncementInput } from './dto/create-announcement.input'
-import type { UpdateAnnouncementInput } from './dto/update-announcement.input'
+import { Injectable, Logger } from '@nestjs/common'
+import { PrismaClientKnownRequestError } from '@prisma/client/runtime/library'
+import {
+  EntityNotExistException,
+  DuplicateFoundException
+} from '@libs/exception'
+import { PrismaService } from '@libs/prisma'
+import type { AnnouncementInput } from './dto/announcement.input'
 
 @Injectable()
 export class AnnouncementService {
-  create(createAnnouncementInput: CreateAnnouncementInput) {
-    return createAnnouncementInput
+  private readonly logger = new Logger(AnnouncementService.name)
+
+  constructor(private readonly prisma: PrismaService) {}
+
+  async createAnnouncement(announcementInput: AnnouncementInput) {
+    const announcement = await this.prisma.announcement.findFirst({
+      where: {
+        ...(announcementInput.problemId && {
+          problemId: announcementInput.problemId
+        }),
+        contestId: announcementInput.contestId,
+        content: announcementInput.content
+      }
+    })
+    if (announcement) throw new DuplicateFoundException('announcement')
+
+    await this.prisma.contestProblem
+      .findFirstOrThrow({
+        where: {
+          contestId: announcementInput.contestId,
+          ...(announcementInput.problemId && {
+            problemId: announcementInput.problemId
+          })
+        }
+      })
+      .catch((error) => {
+        if (error.name == 'NotFoundError') {
+          throw new EntityNotExistException('contestProblem')
+        }
+      })
+
+    return await this.prisma.announcement.create({
+      data: {
+        ...(announcementInput.problemId && {
+          problemId: announcementInput.problemId
+        }),
+        contestId: announcementInput.contestId,
+        content: announcementInput.content
+      }
+    })
   }
 
-  findAll() {
-    return `This action returns all announcement`
+  async getAnnouncements(contestId: number, problemId?: number) {
+    return await this.prisma.announcement.findMany({
+      where: {
+        ...(problemId && { problemId }),
+        contestId
+      }
+    })
   }
 
-  findOne(id: number) {
-    return `This action returns a #${id} announcement`
+  async getAnnouncementById(id: number) {
+    const announcement = await this.prisma.announcement
+      .findFirstOrThrow({
+        where: {
+          id
+        }
+      })
+      .catch((error) => {
+        if (error.name == 'NotFoundError') {
+          throw new EntityNotExistException('announcement')
+        }
+      })
+    return announcement
   }
 
-  update(id: number, updateAnnouncementInput: UpdateAnnouncementInput) {
-    return updateAnnouncementInput
+  async updateAnnouncement(id: number, content: string) {
+    try {
+      return await this.prisma.announcement.update({
+        where: { id },
+        data: { content }
+      })
+    } catch (error) {
+      if (error instanceof PrismaClientKnownRequestError) {
+        throw new EntityNotExistException('announcement')
+      }
+    }
   }
 
-  remove(id: number) {
-    return `This action removes a #${id} announcement`
+  async removeAnnouncement(id: number) {
+    try {
+      return await this.prisma.announcement.delete({
+        where: { id }
+      })
+    } catch (error) {
+      if (error instanceof PrismaClientKnownRequestError) {
+        throw new EntityNotExistException('announcement')
+      }
+    }
   }
 }
diff --git a/apps/backend/apps/admin/src/announcement/dto/announcement.input.ts b/apps/backend/apps/admin/src/announcement/dto/announcement.input.ts
new file mode 100644
index 0000000000..9ed50c9ff3
--- /dev/null
+++ b/apps/backend/apps/admin/src/announcement/dto/announcement.input.ts
@@ -0,0 +1,13 @@
+import { InputType, Int, Field } from '@nestjs/graphql'
+
+@InputType()
+export class AnnouncementInput {
+  @Field(() => Int, { nullable: true })
+  problemId?: number
+
+  @Field(() => Int)
+  contestId: number
+
+  @Field(() => String)
+  content: string
+}
diff --git a/apps/backend/apps/admin/src/announcement/dto/create-announcement.input.ts b/apps/backend/apps/admin/src/announcement/dto/create-announcement.input.ts
deleted file mode 100644
index 5d59f6ca53..0000000000
--- a/apps/backend/apps/admin/src/announcement/dto/create-announcement.input.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { InputType, Int, Field } from '@nestjs/graphql'
-
-@InputType()
-export class CreateAnnouncementInput {
-  @Field(() => Int, { description: 'Example field (placeholder)' })
-  exampleField: number
-}
diff --git a/apps/backend/apps/admin/src/announcement/dto/update-announcement.input.ts b/apps/backend/apps/admin/src/announcement/dto/update-announcement.input.ts
deleted file mode 100644
index 748bdb4acb..0000000000
--- a/apps/backend/apps/admin/src/announcement/dto/update-announcement.input.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import { InputType, Field, Int, PartialType } from '@nestjs/graphql'
-import { CreateAnnouncementInput } from './create-announcement.input'
-
-@InputType()
-export class UpdateAnnouncementInput extends PartialType(
-  CreateAnnouncementInput
-) {
-  @Field(() => Int)
-  id: number
-}
diff --git a/apps/backend/apps/admin/src/contest/contest.resolver.ts b/apps/backend/apps/admin/src/contest/contest.resolver.ts
index d080adc0d3..eb723cf60f 100644
--- a/apps/backend/apps/admin/src/contest/contest.resolver.ts
+++ b/apps/backend/apps/admin/src/contest/contest.resolver.ts
@@ -5,7 +5,6 @@ import {
   ParseBoolPipe
 } from '@nestjs/common'
 import { Args, Context, Int, Mutation, Query, Resolver } from '@nestjs/graphql'
-import { Contest, ContestProblem } from '@generated'
 import { PrismaClientKnownRequestError } from '@prisma/client/runtime/library'
 import { AuthenticatedRequest, UseRolesGuard } from '@libs/auth'
 import { OPEN_SPACE_ID } from '@libs/constants'
@@ -15,6 +14,8 @@ import {
   UnprocessableDataException
 } from '@libs/exception'
 import { CursorValidationPipe, GroupIDPipe, RequiredIntPipe } from '@libs/pipe'
+import { ContestProblem } from '@admin/@generated'
+import { Contest } from '@admin/@generated'
 import { ContestService } from './contest.service'
 import { ContestWithParticipants } from './model/contest-with-participants.model'
 import { CreateContestInput } from './model/contest.input'
diff --git a/apps/backend/apps/admin/src/contest/contest.service.spec.ts b/apps/backend/apps/admin/src/contest/contest.service.spec.ts
index b11999cb8f..7cffc05626 100644
--- a/apps/backend/apps/admin/src/contest/contest.service.spec.ts
+++ b/apps/backend/apps/admin/src/contest/contest.service.spec.ts
@@ -1,8 +1,5 @@
 import { CACHE_MANAGER } from '@nestjs/cache-manager'
 import { Test, type TestingModule } from '@nestjs/testing'
-import { ContestProblem, Group } from '@generated'
-import { Problem } from '@generated'
-import { Contest } from '@generated'
 import { faker } from '@faker-js/faker'
 import { Prisma } from '@prisma/client'
 import type { Cache } from 'cache-manager'
@@ -10,6 +7,9 @@ import { expect } from 'chai'
 import { stub } from 'sinon'
 import { EntityNotExistException } from '@libs/exception'
 import { PrismaService } from '@libs/prisma'
+import { ContestProblem, Group } from '@admin/@generated'
+import { Problem } from '@admin/@generated'
+import { Contest } from '@admin/@generated'
 import { ContestService } from './contest.service'
 import type { ContestWithParticipants } from './model/contest-with-participants.model'
 import type {
diff --git a/apps/backend/apps/admin/src/contest/contest.service.ts b/apps/backend/apps/admin/src/contest/contest.service.ts
index 6939bd9341..8b90f9666b 100644
--- a/apps/backend/apps/admin/src/contest/contest.service.ts
+++ b/apps/backend/apps/admin/src/contest/contest.service.ts
@@ -4,7 +4,6 @@ import {
   Injectable,
   UnprocessableEntityException
 } from '@nestjs/common'
-import type { Contest } from '@generated'
 import type { ContestProblem } from '@prisma/client'
 import { Cache } from 'cache-manager'
 import {
@@ -18,6 +17,7 @@ import {
   UnprocessableDataException
 } from '@libs/exception'
 import { PrismaService } from '@libs/prisma'
+import type { Contest } from '@admin/@generated'
 import type { CreateContestInput } from './model/contest.input'
 import type { UpdateContestInput } from './model/contest.input'
 import type { PublicizingRequest } from './model/publicizing-request.model'
diff --git a/apps/backend/apps/admin/src/group/group.resolver.ts b/apps/backend/apps/admin/src/group/group.resolver.ts
index 31eeb01d74..32d7849be7 100644
--- a/apps/backend/apps/admin/src/group/group.resolver.ts
+++ b/apps/backend/apps/admin/src/group/group.resolver.ts
@@ -1,6 +1,5 @@
 import { InternalServerErrorException, Logger } from '@nestjs/common'
 import { Args, Int, Query, Mutation, Resolver, Context } from '@nestjs/graphql'
-import { Group } from '@generated'
 import { Role } from '@prisma/client'
 import { AuthenticatedRequest, UseRolesGuard } from '@libs/auth'
 import {
@@ -9,6 +8,7 @@ import {
   ForbiddenAccessException
 } from '@libs/exception'
 import { CursorValidationPipe, GroupIDPipe } from '@libs/pipe'
+import { Group } from '@admin/@generated'
 import { GroupService } from './group.service'
 import { CreateGroupInput, UpdateGroupInput } from './model/group.input'
 import { DeletedUserGroup, FindGroup } from './model/group.output'
diff --git a/apps/backend/apps/admin/src/group/group.service.spec.ts b/apps/backend/apps/admin/src/group/group.service.spec.ts
index 35e35d9cb8..8af848f534 100644
--- a/apps/backend/apps/admin/src/group/group.service.spec.ts
+++ b/apps/backend/apps/admin/src/group/group.service.spec.ts
@@ -1,7 +1,5 @@
 import { CACHE_MANAGER } from '@nestjs/cache-manager'
 import { Test, type TestingModule } from '@nestjs/testing'
-import type { Group } from '@generated'
-import type { User } from '@generated'
 import { faker } from '@faker-js/faker'
 import { Role } from '@prisma/client'
 import type { Cache } from 'cache-manager'
@@ -15,6 +13,8 @@ import {
   ForbiddenAccessException
 } from '@libs/exception'
 import { PrismaService } from '@libs/prisma'
+import type { Group } from '@admin/@generated'
+import type { User } from '@admin/@generated'
 import { GroupService } from './group.service'
 
 const userId = faker.number.int()
diff --git a/apps/backend/apps/admin/src/group/model/group.input.ts b/apps/backend/apps/admin/src/group/model/group.input.ts
index d3cda6a923..a1783c1795 100644
--- a/apps/backend/apps/admin/src/group/model/group.input.ts
+++ b/apps/backend/apps/admin/src/group/model/group.input.ts
@@ -1,6 +1,6 @@
 import { Field } from '@nestjs/graphql'
 import { InputType } from '@nestjs/graphql'
-import { GroupCreateInput, GroupUpdateInput } from '@generated'
+import { GroupCreateInput, GroupUpdateInput } from '@admin/@generated'
 
 @InputType()
 class Config {
diff --git a/apps/backend/apps/admin/src/group/model/group.output.ts b/apps/backend/apps/admin/src/group/model/group.output.ts
index 7016da3465..c539c5cfe4 100644
--- a/apps/backend/apps/admin/src/group/model/group.output.ts
+++ b/apps/backend/apps/admin/src/group/model/group.output.ts
@@ -1,6 +1,6 @@
 import { Field, Int } from '@nestjs/graphql'
 import { ObjectType } from '@nestjs/graphql'
-import { Group } from '@generated'
+import { Group } from '@admin/@generated'
 
 @ObjectType()
 export class FindGroup extends Group {
diff --git a/apps/backend/apps/admin/src/notice/model/notice.input.ts b/apps/backend/apps/admin/src/notice/model/notice.input.ts
index d80cf33f82..f0333401f3 100644
--- a/apps/backend/apps/admin/src/notice/model/notice.input.ts
+++ b/apps/backend/apps/admin/src/notice/model/notice.input.ts
@@ -1,5 +1,5 @@
 import { InputType, PartialType, PickType } from '@nestjs/graphql'
-import { NoticeCreateInput } from '@generated'
+import { NoticeCreateInput } from '@admin/@generated'
 
 @InputType()
 export class CreateNoticeInput extends PickType(NoticeCreateInput, [
diff --git a/apps/backend/apps/admin/src/notice/notice.resolver.ts b/apps/backend/apps/admin/src/notice/notice.resolver.ts
index 49be1822fa..99a9aee6df 100644
--- a/apps/backend/apps/admin/src/notice/notice.resolver.ts
+++ b/apps/backend/apps/admin/src/notice/notice.resolver.ts
@@ -13,10 +13,10 @@ import {
   ResolveField,
   Parent
 } from '@nestjs/graphql'
-import { Group, Notice, User } from '@generated'
 import { AuthenticatedRequest } from '@libs/auth'
 import { EntityNotExistException } from '@libs/exception'
 import { CursorValidationPipe, GroupIDPipe, IDValidationPipe } from '@libs/pipe'
+import { Group, Notice, User } from '@admin/@generated'
 import { GroupService } from '@admin/group/group.service'
 import { UserService } from '@admin/user/user.service'
 import { CreateNoticeInput, UpdateNoticeInput } from './model/notice.input'
diff --git a/apps/backend/apps/admin/src/notice/notice.service.spec.ts b/apps/backend/apps/admin/src/notice/notice.service.spec.ts
index e9b689adbf..047b9a7fb7 100644
--- a/apps/backend/apps/admin/src/notice/notice.service.spec.ts
+++ b/apps/backend/apps/admin/src/notice/notice.service.spec.ts
@@ -1,11 +1,11 @@
 import { Test, type TestingModule } from '@nestjs/testing'
-import type { Notice } from '@generated'
 import { faker } from '@faker-js/faker'
 import { PrismaClientKnownRequestError } from '@prisma/client/runtime/library'
 import { expect } from 'chai'
 import { stub } from 'sinon'
 import { EntityNotExistException } from '@libs/exception'
 import { PrismaService } from '@libs/prisma'
+import type { Notice } from '@admin/@generated'
 import type { CreateNoticeInput, UpdateNoticeInput } from './model/notice.input'
 import { NoticeService } from './notice.service'
 
diff --git a/apps/backend/apps/admin/src/problem/model/problem.input.ts b/apps/backend/apps/admin/src/problem/model/problem.input.ts
index 82a7369d98..97067444d3 100644
--- a/apps/backend/apps/admin/src/problem/model/problem.input.ts
+++ b/apps/backend/apps/admin/src/problem/model/problem.input.ts
@@ -1,7 +1,7 @@
 import { Field, InputType, Int } from '@nestjs/graphql'
-import { Language, Level } from '@generated'
 import { ValidatePromise } from 'class-validator'
 import { GraphQLUpload } from 'graphql-upload'
+import { Language, Level } from '@admin/@generated'
 import type { FileUploadDto } from '../dto/file-upload.dto'
 import { Template } from './template.input'
 import { Sample, Testcase } from './testcase.input'
diff --git a/apps/backend/apps/admin/src/problem/model/template.input.ts b/apps/backend/apps/admin/src/problem/model/template.input.ts
index e19a5ede98..c20b976eff 100644
--- a/apps/backend/apps/admin/src/problem/model/template.input.ts
+++ b/apps/backend/apps/admin/src/problem/model/template.input.ts
@@ -1,5 +1,5 @@
 import { Field, InputType, Int } from '@nestjs/graphql'
-import { Language } from '@generated'
+import { Language } from '@admin/@generated'
 
 @InputType()
 class Snippet {
diff --git a/apps/backend/apps/admin/src/user/user.resolver.ts b/apps/backend/apps/admin/src/user/user.resolver.ts
index 8b3ff23a79..b201d4422f 100644
--- a/apps/backend/apps/admin/src/user/user.resolver.ts
+++ b/apps/backend/apps/admin/src/user/user.resolver.ts
@@ -6,10 +6,10 @@ import {
   NotFoundException
 } from '@nestjs/common'
 import { Resolver, Query, Mutation, Args, Int } from '@nestjs/graphql'
-import { UserGroup } from '@generated'
-import { User } from '@generated'
 import { OPEN_SPACE_ID } from '@libs/constants'
 import { CursorValidationPipe, GroupIDPipe, RequiredIntPipe } from '@libs/pipe'
+import { UserGroup } from '@admin/@generated'
+import { User } from '@admin/@generated'
 import { GroupMember } from './model/groupMember.model'
 import { UserService } from './user.service'
 
diff --git a/apps/backend/apps/admin/src/user/user.service.ts b/apps/backend/apps/admin/src/user/user.service.ts
index 173e0363c2..0ddc65ba7f 100644
--- a/apps/backend/apps/admin/src/user/user.service.ts
+++ b/apps/backend/apps/admin/src/user/user.service.ts
@@ -6,7 +6,6 @@ import {
   Injectable,
   NotFoundException
 } from '@nestjs/common'
-import type { UserGroup } from '@generated'
 import { Role } from '@prisma/client'
 import { Cache } from 'cache-manager'
 import { joinGroupCacheKey } from '@libs/cache'
@@ -14,6 +13,7 @@ import { JOIN_GROUP_REQUEST_EXPIRE_TIME } from '@libs/constants'
 import { EntityNotExistException } from '@libs/exception'
 import { PrismaService } from '@libs/prisma'
 import type { GroupJoinRequest } from '@libs/types'
+import type { UserGroup } from '@admin/@generated'
 
 @Injectable()
 export class UserService {
diff --git a/apps/backend/tsconfig.json b/apps/backend/tsconfig.json
index f54c34e134..38d0ce4995 100644
--- a/apps/backend/tsconfig.json
+++ b/apps/backend/tsconfig.json
@@ -20,7 +20,7 @@
     "paths": {
       "@admin/*": ["./apps/admin/src/*"],
       "@client/*": ["./apps/client/src/*"],
-      "@generated": ["./apps/admin/src/@generated"],
+      "@generated": ["apps/admin/src/@generated"],
       "@libs/prisma": ["./libs/prisma/src/index.ts"],
       "@libs/cache": ["./libs/cache/src/index.ts"],
       "@libs/auth": ["./libs/auth/src/index.ts"],
diff --git a/collection/admin/Announcement/Create Announcement/Error: Duplicated Announcement.bru b/collection/admin/Announcement/Create Announcement/Error: Duplicated Announcement.bru
new file mode 100644
index 0000000000..9b917e6463
--- /dev/null
+++ b/collection/admin/Announcement/Create Announcement/Error: Duplicated Announcement.bru	
@@ -0,0 +1,38 @@
+meta {
+  name: Error: Duplicated Announcement
+  type: graphql
+  seq: 2
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  mutation($problemId: Int, $content: String!) {
+    createAnnouncement(
+      createAnnouncementInput: {
+        problemId: $problemId
+        content: $content
+      }
+    ) {
+      id
+      problemId
+      content
+    }
+  }
+}
+
+body:graphql:vars {
+  {
+    "problemId": 1,
+    "contestId": 1,
+    "content": "this is new announcement"
+  }
+}
+
+assert {
+  res.body.errors: isDefined
+}
diff --git a/collection/admin/Announcement/Create Announcement/Error: Invalid Problem ID.bru b/collection/admin/Announcement/Create Announcement/Error: Invalid Problem ID.bru
new file mode 100644
index 0000000000..f30162a931
--- /dev/null
+++ b/collection/admin/Announcement/Create Announcement/Error: Invalid Problem ID.bru	
@@ -0,0 +1,41 @@
+meta {
+  name: Error: Invalid Problem ID
+  type: graphql
+  seq: 3
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  mutation($problemId: Int, $contestId: Int!, $content: String!) {
+    createAnnouncement(
+      createAnnouncementInput: {
+        problemId: $problemId
+        contestId: $contestId
+        content: $content
+      }
+    ) {
+      id
+      problemId
+      content
+    }
+  }
+  
+  
+}
+
+body:graphql:vars {
+  {
+    "problemId": -9999999,
+    "contestId": -9999999,
+    "content": "this is new announcement"
+  }
+}
+
+assert {
+  res.body.errors: isDefined
+}
diff --git a/collection/admin/Announcement/Create Announcement/Succeed.bru b/collection/admin/Announcement/Create Announcement/Succeed.bru
new file mode 100644
index 0000000000..fcb54fa064
--- /dev/null
+++ b/collection/admin/Announcement/Create Announcement/Succeed.bru	
@@ -0,0 +1,59 @@
+meta {
+  name: Succeed
+  type: graphql
+  seq: 1
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  mutation($problemId: Int, $contestId: Int!, $content: String!) {
+    createAnnouncement(
+      createAnnouncementInput: {
+        problemId: $problemId
+        contestId: $contestId
+        content: $content
+      }
+    ) {
+      id
+      problemId
+      content
+    }
+  }
+  
+  
+}
+
+body:graphql:vars {
+  {
+    "problemId": 1,
+    "contestId": 1,
+    "content": "this is new announcement"
+  }
+}
+
+assert {
+  res.body.data.createAnnouncement: isDefined
+}
+
+docs {
+  ## Create Announcement
+  새로운 Announcement를 생성합니다.
+  
+  ### Args
+  | 이름 | 타입 | 설명|
+  |--|--|--|
+  |problemId|int(optional)|Announcement를 추가할 문제의 id|
+  |contestId|int|Announcement를 추가할 contest의 id|
+  |content|string|추가할 Announcement의 내용|
+  
+  ### Error Case
+  #### CONFLICT
+  추가하려는 것과 problemId, content가 모두 일치하는 Announcement가 이미 존재
+  #### NOT_FOUND
+  존재하지 않는 problemId
+}
diff --git a/collection/admin/Announcement/Delete Announcement/Error: Invalid Announcement ID.bru b/collection/admin/Announcement/Delete Announcement/Error: Invalid Announcement ID.bru
new file mode 100644
index 0000000000..e962e89ef8
--- /dev/null
+++ b/collection/admin/Announcement/Delete Announcement/Error: Invalid Announcement ID.bru	
@@ -0,0 +1,33 @@
+meta {
+  name: Error: Invalid Announcement ID
+  type: graphql
+  seq: 2
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  mutation($id: Int!) {
+    removeAnnouncement(
+      id: $id
+    ) {
+      id
+      problemId
+      content
+    }
+  }
+}
+
+body:graphql:vars {
+  {
+    "id": -999999
+  }
+}
+
+assert {
+  res.body.errors: isDefined
+}
diff --git a/collection/admin/Announcement/Delete Announcement/Succeed.bru b/collection/admin/Announcement/Delete Announcement/Succeed.bru
new file mode 100644
index 0000000000..c15ebb727b
--- /dev/null
+++ b/collection/admin/Announcement/Delete Announcement/Succeed.bru	
@@ -0,0 +1,47 @@
+meta {
+  name: Succeed
+  type: graphql
+  seq: 1
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  mutation($id: Int!) {
+    removeAnnouncement(
+      id: $id
+    ) {
+      id
+      problemId
+      content
+    }
+  }
+}
+
+body:graphql:vars {
+  {
+    "id": 1
+  }
+}
+
+assert {
+  res.body.data.removeAnnouncement: isDefined
+}
+
+docs {
+  ## Delete Announcement
+  Announcement를 제거합니다.
+  
+  ### Args
+  | 이름 | 타입 | 설명|
+  |--|--|--|
+  |id|int|제거할 Announcement id|
+  
+  ### Error Case
+  #### NOT_FOUND
+  존재하지 않는 id
+}
diff --git a/collection/admin/Announcement/Get Announcement/Error: Invalid Announcement ID.bru b/collection/admin/Announcement/Get Announcement/Error: Invalid Announcement ID.bru
new file mode 100644
index 0000000000..62252b00bc
--- /dev/null
+++ b/collection/admin/Announcement/Get Announcement/Error: Invalid Announcement ID.bru	
@@ -0,0 +1,35 @@
+meta {
+  name: Error: Invalid Announcement ID
+  type: graphql
+  seq: 2
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  query($id: Int!) {
+    getAnnouncementById(
+      id: $id
+    ) {
+    	id
+      problemId
+      contestId
+      content
+    }
+  }
+  
+}
+
+body:graphql:vars {
+  {
+    "id": -999999
+  }
+}
+
+assert {
+  res.body.errors: isDefined
+}
diff --git a/collection/admin/Announcement/Get Announcement/Succeed.bru b/collection/admin/Announcement/Get Announcement/Succeed.bru
new file mode 100644
index 0000000000..48b87b80e5
--- /dev/null
+++ b/collection/admin/Announcement/Get Announcement/Succeed.bru	
@@ -0,0 +1,49 @@
+meta {
+  name: Succeed
+  type: graphql
+  seq: 1
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  query($id: Int!) {
+    getAnnouncementById(
+      id: $id
+    ) {
+    	id
+      problemId
+      contestId
+      content
+    }
+  }
+  
+}
+
+body:graphql:vars {
+  {
+    "id": 1
+  }
+}
+
+assert {
+  res.body.data.getAnnouncementById: isDefined
+}
+
+docs {
+  ## Get Announcement
+  Announcement의 정보를 조회합니다.
+  
+  ### Args
+  | 이름 | 타입 | 설명|
+  |--|--|--|
+  |id|int|조회할 Announcement의 id|
+  
+  ### Error Case
+  #### NOT_FOUND
+  존재하지 않는 id
+}
diff --git a/collection/admin/Announcement/Get Announcements/Succeed.bru b/collection/admin/Announcement/Get Announcements/Succeed.bru
new file mode 100644
index 0000000000..bbedaac785
--- /dev/null
+++ b/collection/admin/Announcement/Get Announcements/Succeed.bru	
@@ -0,0 +1,49 @@
+meta {
+  name: Succeed
+  type: graphql
+  seq: 1
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  query($contestId: Int!, $problemId: Int) {
+    getAnnouncements(
+      contestId: $contestId
+      problemId: $problemId
+    ) {
+    	id
+      problemId
+      contestId
+      content
+    }
+  }
+  
+  
+}
+
+body:graphql:vars {
+  {
+    "problemId": 1,
+    "contestId": 1
+  }
+}
+
+assert {
+  res.body.data.getAnnouncements: isDefined
+}
+
+docs {
+  ## Get Announcements
+  해당 문제에 등록된 모든 Announcement를 조회합니다.
+  
+  ### Args
+  | 이름 | 타입 | 설명|
+  |--|--|--|
+  |contestId|int|Announcement를 조회할 contest의 id|
+  |problemId|int(optional)|Announcement를 조회할 문제의 id|
+}
diff --git a/collection/admin/Announcement/Update Announcement/Error: Invalid Announcement ID.bru b/collection/admin/Announcement/Update Announcement/Error: Invalid Announcement ID.bru
new file mode 100644
index 0000000000..7dc21dccdb
--- /dev/null
+++ b/collection/admin/Announcement/Update Announcement/Error: Invalid Announcement ID.bru	
@@ -0,0 +1,36 @@
+meta {
+  name: Error: Invalid Announcement ID
+  type: graphql
+  seq: 2
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  mutation($id: Int!, $content: String!) {
+    updateAnnouncement(
+      id: $id
+      content: $content
+    ) {
+      id
+      problemId
+      content
+    }
+  }
+  
+}
+
+body:graphql:vars {
+  {
+    "id": -99999,
+    "content": "updated announcement"
+  }
+}
+
+assert {
+  res.body.errors: isDefined
+}
diff --git a/collection/admin/Announcement/Update Announcement/Succeed.bru b/collection/admin/Announcement/Update Announcement/Succeed.bru
new file mode 100644
index 0000000000..148011ea34
--- /dev/null
+++ b/collection/admin/Announcement/Update Announcement/Succeed.bru	
@@ -0,0 +1,48 @@
+meta {
+  name: Succeed
+  type: graphql
+  seq: 1
+}
+
+post {
+  url: {{gqlUrl}}
+  body: graphql
+  auth: none
+}
+
+body:graphql {
+  mutation($id: Int!, $content: String!) {
+    updateAnnouncement(
+      id: $id
+      content: $content
+    ) {
+      id
+      problemId
+      content
+    }
+  }
+  
+  
+}
+
+body:graphql:vars {
+  {
+    "id": 1,
+    "content": "updated announcement"
+  }
+}
+
+assert {
+  res.body.data.updateAnnouncement: isDefined
+}
+
+docs {
+  ## Update Announcment
+  Announcement의 내용을 업데이트합니다.
+  
+  ### Args
+  | 이름 | 타입 | 설명|
+  |--|--|--|
+  |Id|int|Announcement의 id|
+  |content|string|수정할 Announcement의 내용|
+}