diff --git a/src/main/java/inha/gdgoc/domain/admin/recruit/core/controller/RecruitCoreAdminController.java b/src/main/java/inha/gdgoc/domain/admin/recruit/core/controller/RecruitCoreAdminController.java
index 0a129b8..b1e4657 100644
--- a/src/main/java/inha/gdgoc/domain/admin/recruit/core/controller/RecruitCoreAdminController.java
+++ b/src/main/java/inha/gdgoc/domain/admin/recruit/core/controller/RecruitCoreAdminController.java
@@ -6,6 +6,7 @@
 import inha.gdgoc.domain.admin.recruit.core.dto.response.RecruitCoreApplicationDecisionResponse;
 import inha.gdgoc.domain.admin.recruit.core.dto.response.RecruitCoreApplicationPageResponse;
 import inha.gdgoc.domain.admin.recruit.core.service.RecruitCoreAdminService;
+import inha.gdgoc.domain.recruit.core.dto.response.RecruitCoreApplicantDetailResponse;
 import inha.gdgoc.domain.recruit.core.entity.RecruitCoreApplication;
 import inha.gdgoc.domain.recruit.core.enums.RecruitCoreResultStatus;
 import inha.gdgoc.domain.user.enums.TeamType;
@@ -65,6 +66,12 @@ public RecruitCoreApplicationPageResponse list(
         );
     }
 
+    @PreAuthorize(ORGANIZER_OR_HR_LEAD_RULE)
+    @GetMapping("/{applicationId}")
+    public ResponseEntity<RecruitCoreApplicantDetailResponse> detail(@PathVariable Long applicationId) {
+        return ResponseEntity.ok(adminService.getApplicationDetail(applicationId));
+    }
+
     @PreAuthorize(ORGANIZER_OR_HR_LEAD_RULE)
     @PostMapping("/{applicationId}/accept")
     public ResponseEntity<RecruitCoreApplicationDecisionResponse> accept(
diff --git a/src/main/java/inha/gdgoc/domain/admin/recruit/core/service/RecruitCoreAdminService.java b/src/main/java/inha/gdgoc/domain/admin/recruit/core/service/RecruitCoreAdminService.java
index 2b6a41f..ec13eac 100644
--- a/src/main/java/inha/gdgoc/domain/admin/recruit/core/service/RecruitCoreAdminService.java
+++ b/src/main/java/inha/gdgoc/domain/admin/recruit/core/service/RecruitCoreAdminService.java
@@ -2,6 +2,7 @@
 
 import inha.gdgoc.domain.admin.recruit.core.dto.request.RecruitCoreApplicationAcceptRequest;
 import inha.gdgoc.domain.admin.recruit.core.dto.request.RecruitCoreApplicationRejectRequest;
+import inha.gdgoc.domain.recruit.core.dto.response.RecruitCoreApplicantDetailResponse;
 import inha.gdgoc.domain.admin.recruit.core.dto.response.RecruitCoreApplicationDecisionResponse;
 import inha.gdgoc.domain.recruit.core.entity.RecruitCoreApplication;
 import inha.gdgoc.domain.recruit.core.enums.RecruitCoreResultStatus;
@@ -43,6 +44,11 @@ public Page<RecruitCoreApplication> searchApplications(
         return repository.findAll(spec, pageable);
     }
 
+    @Transactional(readOnly = true)
+    public RecruitCoreApplicantDetailResponse getApplicationDetail(Long applicationId) {
+        return RecruitCoreApplicantDetailResponse.from(getApplication(applicationId));
+    }
+
     @Transactional
     public RecruitCoreApplicationDecisionResponse accept(
         Long applicationId,
diff --git a/src/main/java/inha/gdgoc/domain/admin/user/service/UserAdminService.java b/src/main/java/inha/gdgoc/domain/admin/user/service/UserAdminService.java
index d802c4b..ed223df 100644
--- a/src/main/java/inha/gdgoc/domain/admin/user/service/UserAdminService.java
+++ b/src/main/java/inha/gdgoc/domain/admin/user/service/UserAdminService.java
@@ -236,11 +236,11 @@ private void validateLeadAndCorePolicy(
         }
 
         if (editorRole == UserRole.LEAD) {
-            if (!(targetCurrentRole == UserRole.MEMBER || targetCurrentRole == UserRole.CORE)) {
-                throw new BusinessException(GlobalErrorCode.FORBIDDEN_USER, "LEAD는 MEMBER/CORE만 수정할 수 있습니다.");
+            if (!(targetCurrentRole == UserRole.GUEST || targetCurrentRole == UserRole.MEMBER || targetCurrentRole == UserRole.CORE)) {
+                throw new BusinessException(GlobalErrorCode.FORBIDDEN_USER, "LEAD는 GUEST/MEMBER/CORE만 수정할 수 있습니다.");
             }
-            if (!(newRole == UserRole.MEMBER || newRole == UserRole.CORE)) {
-                throw new BusinessException(GlobalErrorCode.FORBIDDEN_USER, "LEAD는 MEMBER/CORE로만 변경할 수 있습니다.");
+            if (!(newRole == UserRole.GUEST || newRole == UserRole.MEMBER || newRole == UserRole.CORE)) {
+                throw new BusinessException(GlobalErrorCode.FORBIDDEN_USER, "LEAD는 GUEST/MEMBER/CORE로만 변경할 수 있습니다.");
             }
         }