diff --git a/src/main/java/treehouse/server/api/invitation/business/InvitationService.java b/src/main/java/treehouse/server/api/invitation/business/InvitationService.java
index c003110..ecf2990 100644
--- a/src/main/java/treehouse/server/api/invitation/business/InvitationService.java
+++ b/src/main/java/treehouse/server/api/invitation/business/InvitationService.java
@@ -48,7 +48,7 @@ public class InvitationService {
     @Transactional
     public InvitationResponseDTO.getInvitations getInvitations(User user) {
 
-        List<Invitation> invitations = invitationQueryAdapter.findAllPendingByPhone(user.getPhone());
+        List<Invitation> invitations = invitationQueryAdapter.findAllByPhone(user.getPhone());
 
         List<InvitationResponseDTO.getInvitation> invitationDtos = invitations.stream()
                 .map(invitation -> {
@@ -117,7 +117,16 @@ public InvitationResponseDTO.invitationAccept decisionInvitation(User user, Invi
             treehouseId = invitation.getTreeHouse().getId(); // treehouse 관련 로직 개발 후, invitation.getTreeHouse.getId() 등으로 바꾸기
             // 초대장 수락
             invitationCommandAdapter.acceptInvitation(invitation);
+        } else if (request.isAcceptDecision()==false) {
+            // 초대장 거절
+            invitationCommandAdapter.deleteInvitation(invitation);
         }
         return InvitationMapper.toInvitationResult(treehouseId);
     }
+
+    @Transactional
+    public void deleteInvitation(Long invitationId) {
+        Invitation invitation = invitationQueryAdapter.findById(invitationId);
+        invitationCommandAdapter.deleteInvitation(invitation);
+    }
 }
diff --git a/src/main/java/treehouse/server/api/invitation/implement/InvitationCommandAdapter.java b/src/main/java/treehouse/server/api/invitation/implement/InvitationCommandAdapter.java
index 8f75e93..a3e8990 100644
--- a/src/main/java/treehouse/server/api/invitation/implement/InvitationCommandAdapter.java
+++ b/src/main/java/treehouse/server/api/invitation/implement/InvitationCommandAdapter.java
@@ -36,4 +36,5 @@ public void acceptInvitation(Invitation invitation) {
         invitation.setStatus(InvitationStatus.ACCEPTED);
         invitationRepository.save(invitation);
     }
+
 }
diff --git a/src/main/java/treehouse/server/api/invitation/presentation/InvitationApi.java b/src/main/java/treehouse/server/api/invitation/presentation/InvitationApi.java
index 7147361..ac5dcfb 100644
--- a/src/main/java/treehouse/server/api/invitation/presentation/InvitationApi.java
+++ b/src/main/java/treehouse/server/api/invitation/presentation/InvitationApi.java
@@ -53,4 +53,13 @@ public CommonResponse<InvitationResponseDTO.createInvitation> createInvitation(
     ){
         return CommonResponse.onSuccess(invitationService.createInvitation(user,request));
     }
+
+    @DeleteMapping("/invitation/{invitationId}")
+    @Operation(summary = "초대장 삭제 API ✅ 🔑", description = "초대장을 삭제하는 API 입니다.")
+    public CommonResponse deleteInvitation(
+            @PathVariable Long invitationId
+    ){
+        invitationService.deleteInvitation(invitationId);
+        return CommonResponse.onSuccess(null);
+    }
 }
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index caa2534..faf3ce5 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -143,8 +143,8 @@ jwt:
     key: ${JWT_SECRET}
   #  secret : ${JWT_SECRET}
   authorities-key: authoritiesKey
-  access-token-validity-in-seconds: 7200000 # 2 hour
-  refresh-token-validity-in-seconds: 2592000000 # 30 day
+  access-token-validity-in-seconds: 120000 # 2 min
+  refresh-token-validity-in-seconds: 300000 # 30 day
 
 firebase:
   admin-sdk: ${FCM_KEY}