diff --git a/Controllers/CandidateController.cs b/Controllers/CandidateController.cs
index 54755f3..fff1227 100644
--- a/Controllers/CandidateController.cs
+++ b/Controllers/CandidateController.cs
@@ -803,6 +803,32 @@ namespace BMA.EHR.Recurit.Exam.Service.Controllers
             }
         }
 
+        /// <summary>
+        /// เจ้าหน้าที่ย้อนสถานะเป็นตรวจสอบข้อมูล
+        /// </summary>
+        /// <param name="candidateId">รหัสใบสมัคร</param>
+        /// <returns></returns>
+        /// <response code="200">เมื่อเจ้าหน้าที่ตรวจคุณสมบัติผู้สมัครสำเร็จ</response>
+        /// <response code="401">ไม่ได้ Login เข้าระบบ</response>
+        /// <response code="500">เมื่อเกิดข้อผิดพลาดในการทำงาน</response>
+        [HttpPut("reject/check-register/{candidateId:length(36)}")]
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+        [ProducesResponseType(StatusCodes.Status500InternalServerError)]
+        public async Task<ActionResult<ResponseObject>> AdminRejectToCheckCandidateService(Guid candidateId, RequestReject item)
+        {
+            try
+            {
+                await _candidateService.AdminRejectToCheckCandidateService(candidateId, item.Reason);
+
+                return Success();
+            }
+            catch (Exception ex)
+            {
+                return Error(ex);
+            }
+        }
+
         /// <summary>
         /// เจ้าหน้าที่ตรวจคุณสมบัติผู้สมัครไม่ผ่านและให้สมัครใหม่
         /// </summary>
diff --git a/Request/RequestReject.cs b/Request/RequestReject.cs
new file mode 100644
index 0000000..40eb40a
--- /dev/null
+++ b/Request/RequestReject.cs
@@ -0,0 +1,9 @@
+using System.Net;
+
+namespace BMA.EHR.Recurit.Exam.Service.Request
+{
+    public class RequestReject
+    {
+        public string? Reason { get; set; }
+    }
+}
diff --git a/Services/CandidateService.cs b/Services/CandidateService.cs
index cbe675a..8ce9b3e 100644
--- a/Services/CandidateService.cs
+++ b/Services/CandidateService.cs
@@ -2004,6 +2004,7 @@ namespace BMA.EHR.Recurit.Exam.Service.Services
                 if (candidate.Email != null && candidate.Email != "") _mailService.SendMailToUser(subject, body, candidate.Email);
             }
             candidate.Status = status;
+            candidate.RejectDetail = null;
 
             await _context.SaveChangesAsync();
         }
@@ -2039,7 +2040,7 @@ namespace BMA.EHR.Recurit.Exam.Service.Services
                     if (candidate.Email != null && candidate.Email != "") _mailService.SendMailToUser(subject, body, candidate.Email);
                     candidate.RejectDetail = item.Reason;
                 }
-                if (status == "rejectPayment")
+                else if (status == "rejectPayment")
                 {
                     var subject = "แจ้งผลการสมัครสอบคัดเลือก " + candidate.PeriodExam.Name;
                     var body = candidate.FirstName + " " + candidate.LastName + " มีหลักฐานชำระเงินไม่ถูกต้องกรุณาตรวจสอบข้อมูล  เนื่องจาก: " + item.Reason;
@@ -2052,6 +2053,7 @@ namespace BMA.EHR.Recurit.Exam.Service.Services
                     var body = candidate.FirstName + " " + candidate.LastName + " สถานะการสมัครสอบ: ได้รับใบสมัครแล้ว";
                     if (candidate.Email != null && candidate.Email != "") _mailService.SendMailToUser(subject, body, candidate.Email);
                     candidate.Status = "checkSeat";
+                    candidate.RejectDetail = null;
                     // var num = periodExam.Count() + 1;
                     // candidate.ExamIdenNumber = candidate.PositionExam == null ? num.ToString() : candidate.PositionExam.Code + num;
                 }
@@ -2060,8 +2062,9 @@ namespace BMA.EHR.Recurit.Exam.Service.Services
                     var subject = "แจ้งผลการสมัครสอบคัดเลือก " + candidate.PeriodExam.Name;
                     var body = candidate.FirstName + " " + candidate.LastName + " สถานะการสมัครสอบ: รอชำระค่าสมัครสอบ";
                     if (candidate.Email != null && candidate.Email != "") _mailService.SendMailToUser(subject, body, candidate.Email);
+                    candidate.RejectDetail = null;
                 }
-                else if (candidate.Status == "checkSeat")
+                else if (status == "checkSeat")
                 {
                     var subject = "แจ้งผลการสมัครสอบคัดเลือก " + candidate.PeriodExam.Name;
                     var body = candidate.FirstName + " " + candidate.LastName + " สถานะการสมัครสอบ: ได้ชำระค่าสมัครสอบแล้ว";
@@ -2069,6 +2072,7 @@ namespace BMA.EHR.Recurit.Exam.Service.Services
                     // var num = periodExam.Count() + 1;
                     // candidate.ExamIdenNumber = candidate.PositionExam == null ? num.ToString() : candidate.PositionExam.Code + num;
                     candidate.PaymentDate = DateTime.Now;
+                    candidate.RejectDetail = null;
                 }
             }
             else
@@ -2111,6 +2115,7 @@ namespace BMA.EHR.Recurit.Exam.Service.Services
                     throw new Exception(GlobalMessages.ExamNotFound);
 
                 candidate.Status = "payment";
+                candidate.RejectDetail = null;
                 if (candidate.PeriodExam.Fee == 0)
                 {
                     var subject = "แจ้งผลการสมัครสอบคัดเลือก " + candidate.PeriodExam.Name;
@@ -2134,6 +2139,24 @@ namespace BMA.EHR.Recurit.Exam.Service.Services
 
             await _context.SaveChangesAsync();
         }
+        public async Task AdminRejectToCheckCandidateService(Guid candidateId, string? reason)
+        {
+            var candidate = await _context.Candidates.AsQueryable()
+                            .Include(x => x.PeriodExam)
+                            .Include(x => x.PositionExam)
+                            .FirstOrDefaultAsync(x => x.Id == candidateId);
+
+            if (candidate == null)
+                throw new Exception(GlobalMessages.CandidateNotFound);
+
+            if (candidate.Status.Trim().ToUpper() != "PAYMENT" && candidate.Status.Trim().ToUpper() != "CHECKSEAT")
+                return;
+
+            candidate.RejectDetail = reason;
+            candidate.Status = "checkRegister";
+
+            await _context.SaveChangesAsync();
+        }
 
         public async Task AdminPassCandidateService(string candidateId, string status)
         {
@@ -2160,6 +2183,7 @@ namespace BMA.EHR.Recurit.Exam.Service.Services
                 if (candidate.Email != null && candidate.Email != "") _mailService.SendMailToUser(subject, body, candidate.Email);
             }
             candidate.Status = status;
+            candidate.RejectDetail = null;
 
             await _context.SaveChangesAsync();
         }