diff --git a/src/main/java/com/petlog/docs/PetGroupControllerDocs.java b/src/main/java/com/petlog/docs/PetGroupControllerDocs.java
index 0c3fb92..17aeebe 100644
--- a/src/main/java/com/petlog/docs/PetGroupControllerDocs.java
+++ b/src/main/java/com/petlog/docs/PetGroupControllerDocs.java
@@ -39,7 +39,7 @@ public interface PetGroupControllerDocs {
 
     @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "참고사항 조회에 성공하였습니다.")
     @Operation(summary = "참고사항 조회 API")
-    ResponseEntity<ApiResponse<GetNoteResponseDto>> getNote(@PathVariable final Long groupId);
+    ResponseEntity<ApiResponse<GetNoteResponseDto>> getNote(@Authenticated final Long memberId, @PathVariable final Long groupId);
 
     @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "참고사항 수정에 성공하였습니다.")
     @Operation(summary = "참고사항 수정 API")
diff --git a/src/main/java/com/petlog/petgroup/controller/PetGroupController.java b/src/main/java/com/petlog/petgroup/controller/PetGroupController.java
index 950b001..a1f36ce 100644
--- a/src/main/java/com/petlog/petgroup/controller/PetGroupController.java
+++ b/src/main/java/com/petlog/petgroup/controller/PetGroupController.java
@@ -13,6 +13,7 @@
 import com.petlog.petgroup.service.dto.CreatePetGroupDto;
 import com.petlog.petgroup.service.dto.GetJoinCodeDto;
 import com.petlog.petgroup.service.dto.GetMyPetGroupDto;
+import com.petlog.petgroup.service.dto.GetNoteDto;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
@@ -103,9 +104,11 @@ public ResponseEntity<ApiResponse<GetJoinCodeResponseDto>> getJoinCode(
 
     @GetMapping("/{groupId}/note")
     public ResponseEntity<ApiResponse<GetNoteResponseDto>> getNote(
+        @Authenticated final Long memberId,
         @PathVariable final Long groupId
     ) {
-        final GetNoteResponseDto response = new GetNoteResponseDto("우리 여름이는 엄청 예쁘구~");
+        final GetNoteDto dto = petGroupService.getNote(memberId, groupId);
+        final GetNoteResponseDto response = new GetNoteResponseDto(dto.note());
 
         return ResponseEntity.ok(
             ApiResponse.successWithData(GET_NOTE, response)
diff --git a/src/main/java/com/petlog/petgroup/controller/dto/response/GetNoteResponseDto.java b/src/main/java/com/petlog/petgroup/controller/dto/response/GetNoteResponseDto.java
index 05bbb6c..94fd75c 100644
--- a/src/main/java/com/petlog/petgroup/controller/dto/response/GetNoteResponseDto.java
+++ b/src/main/java/com/petlog/petgroup/controller/dto/response/GetNoteResponseDto.java
@@ -8,8 +8,4 @@ public record GetNoteResponseDto(
     String note
 
 ) {
-
-    public GetNoteResponseDto(final String note) {
-        this.note = note;
-    }
 }
diff --git a/src/main/java/com/petlog/petgroup/service/PetGroupService.java b/src/main/java/com/petlog/petgroup/service/PetGroupService.java
index 8115abf..1a9134b 100644
--- a/src/main/java/com/petlog/petgroup/service/PetGroupService.java
+++ b/src/main/java/com/petlog/petgroup/service/PetGroupService.java
@@ -17,6 +17,7 @@
 import com.petlog.petgroup.service.dto.CreatePetGroupDto;
 import com.petlog.petgroup.service.dto.GetJoinCodeDto;
 import com.petlog.petgroup.service.dto.GetMyPetGroupDto;
+import com.petlog.petgroup.service.dto.GetNoteDto;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -83,42 +84,53 @@ private Member getMember(final Long memberId) {
 
     @Transactional
     public void joinPetGroup(final Long memberId, final String joinCode) {
-        final PetGroup petGroup = getPetGroup(joinCode);
         final Member member = getMember(memberId);
+        final PetGroup petGroup = getPetGroupByJoinCode(joinCode);
+        validateAlreadyMemberInPetGroup(member, petGroup);
 
         final PetGroupMember petGroupMember = new PetGroupMember(member, petGroup, false);
         petGroupMemberRepository.save(petGroupMember);
     }
 
-    private PetGroup getPetGroup(final String joinCode) {
+    private PetGroup getPetGroupByJoinCode(final String joinCode) {
         return petGroupRepository.findByJoinCode(joinCode)
             .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 그룹입니다."));
     }
 
+    private void validateAlreadyMemberInPetGroup(final Member member, final PetGroup petGroup) {
+        if(petGroupMemberRepository.existsByMemberAndPetGroup(member, petGroup)) {
+            throw new IllegalArgumentException("이미 그룹에 참여중인 회원입니다.");
+        }
+    }
+
     @Transactional(readOnly = true)
     public GetMyPetGroupDto getMyPetGroups(final Long memberId) {
-        validateMemberIsExist(memberId);
+        getMember(memberId);
         final List<Long> groupIds = petGroupMemberRepository.findPetGroupIdsByMemberId(memberId);
         return new GetMyPetGroupDto(groupIds);
     }
 
-    private void validateMemberIsExist(final Long memberId) {
-        memberRepository.findById(memberId)
-            .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 회원입니다."));
-    }
-
     @Transactional
     public void leavePetGroup(final Long memberId, final Long groupId) {
-        validateMemberIsExist(memberId);
-        validatePetGroupIsExist(groupId);
+        final Member member = getMember(memberId);
+        final PetGroup petGroup = getPetGroup(groupId);
+        validateMemberInPetGroup(member, petGroup);
+
         petGroupMemberRepository.deleteByMemberIdAndGroupId(memberId, groupId);
     }
 
-    private void validatePetGroupIsExist(final Long petGroupId) {
-        petGroupRepository.findById(petGroupId)
+    private PetGroup getPetGroup(final Long petGroupId) {
+        return petGroupRepository.findById(petGroupId)
             .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 그룹입니다."));
     }
 
+    private void validateMemberInPetGroup(final Member member, final PetGroup petGroup) {
+        if(!petGroupMemberRepository.existsByMemberAndPetGroup(member, petGroup)) {
+            throw new IllegalArgumentException("그룹에 존재하지 않는 회원입니다.");
+        }
+    }
+
+    @Transactional(readOnly = true)
     public GetJoinCodeDto getPetGroupJoinCode(final Long memberId, final Long groupId) {
         final Member member = getMember(memberId);
         final PetGroup petGroup = getPetGroup(groupId);
@@ -127,14 +139,12 @@ public GetJoinCodeDto getPetGroupJoinCode(final Long memberId, final Long groupI
         return new GetJoinCodeDto(petGroup.getJoinCode());
     }
 
-    private PetGroup getPetGroup(final Long groupId) {
-        return petGroupRepository.findById(groupId)
-            .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 그룹입니다."));
-    }
+    @Transactional(readOnly = true)
+    public GetNoteDto getNote(final Long memberId, final Long groupId) {
+        final Member member = getMember(memberId);
+        final PetGroup petGroup = getPetGroup(groupId);
+        validateMemberInPetGroup(member, petGroup);
 
-    private void validateMemberInPetGroup(final Member member, final PetGroup petGroup) {
-        if(!petGroupMemberRepository.existsByMemberAndPetGroup(member, petGroup)) {
-            throw new IllegalArgumentException("그룹에 존재하지 않는 회원입니다.");
-        }
+        return new GetNoteDto(petGroup.getNote());
     }
 }
diff --git a/src/main/java/com/petlog/petgroup/service/dto/GetNoteDto.java b/src/main/java/com/petlog/petgroup/service/dto/GetNoteDto.java
new file mode 100644
index 0000000..0494f4b
--- /dev/null
+++ b/src/main/java/com/petlog/petgroup/service/dto/GetNoteDto.java
@@ -0,0 +1,8 @@
+package com.petlog.petgroup.service.dto;
+
+public record GetNoteDto(
+
+    String note
+
+) {
+}