diff --git a/src/main/java/com/eactive/apim/portal/apps/user/controller/AccountController.java b/src/main/java/com/eactive/apim/portal/apps/user/controller/AccountController.java
index fec67da..e7dcd34 100644
--- a/src/main/java/com/eactive/apim/portal/apps/user/controller/AccountController.java
+++ b/src/main/java/com/eactive/apim/portal/apps/user/controller/AccountController.java
@@ -16,7 +16,9 @@ import com.eactive.apim.portal.invitation.repository.UserInvitationRepository;
 import com.eactive.apim.portal.portaluser.entity.PortalUserEnums;
 import com.eactive.apim.portal.portaluser.entity.PortalUserEnums.RoleCode;
 import java.util.Arrays;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import javax.servlet.http.Cookie;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
@@ -36,6 +38,7 @@ import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 
@@ -271,18 +274,20 @@ public class AccountController {
 
 
     @PostMapping("/mypage/org-transfer")
-    public String processOrgTransfer(
+    @ResponseBody
+    public Map<String, Object> processOrgTransfer(
         @ModelAttribute PortalOrgRegistrationDTO orgDTO,
         @ModelAttribute UserAgreementDTO agreementDTO,
         HttpServletRequest request,
-        HttpServletResponse response,
-        RedirectAttributes redirectAttributes) {
+        HttpServletResponse response) {
+        Map<String, Object> result = new HashMap<>();
         try {
             var currentUser = SecurityUtil.getPortalAuthenticatedUser();
 
             if (currentUser.getRoleCode() != PortalUserEnums.RoleCode.ROLE_USER) {
-                redirectAttributes.addFlashAttribute("error", "잘못된 접근입니다.");
-                return "redirect:/mypage";
+                result.put("status", "ERROR");
+                result.put("message", "잘못된 접근입니다.");
+                return result;
             }
 
             ValidationResponse validationResponse = orgRegisterFacade.convertToOrgUser(
@@ -310,16 +315,20 @@ public class AccountController {
                     }
                 }
 
-                redirectAttributes.addFlashAttribute("success", validationResponse.getMessage());
-                return "apps/mypage/UserConversionCompleted";
+                result.put("status", "SUCCESS");
+                result.put("message", validationResponse.getMessage());
+                result.put("redirectUrl", "/");
+                return result;
             } else {
-                redirectAttributes.addFlashAttribute("error", validationResponse.getMessage());
-                return "redirect:/mypage/org-transfer";
+                result.put("status", "ERROR");
+                result.put("message", validationResponse.getMessage());
+                return result;
             }
 
         } catch (Exception e) {
-            redirectAttributes.addFlashAttribute("error", "법인회원 전환 중 오류가 발생했습니다: " + e.getMessage());
-            return "redirect:/mypage/org-transfer";
+            result.put("status", "ERROR");
+            result.put("message", "법인회원 전환 중 오류가 발생했습니다: " + e.getMessage());
+            return result;
         }
     }
 
diff --git a/src/main/resources/templates/views/apps/apis/mainApiDetail.html b/src/main/resources/templates/views/apps/apis/mainApiDetail.html
index f932709..379adac 100644
--- a/src/main/resources/templates/views/apps/apis/mainApiDetail.html
+++ b/src/main/resources/templates/views/apps/apis/mainApiDetail.html
@@ -30,29 +30,13 @@
           </a>
         </div>
 
-        <!-- Service Categories (Accordion) -->
-        <div class="menu-section accordion-section" th:each="service : ${services}">
-          <div class="menu-title accordion-trigger"
-               th:classappend="${selected == service.id} ? 'active expanded'"
-               th:data-group="${service.id}">
-            <span class="menu-title-text">[[${service.groupName}]]</span>
-            <span class="accordion-icon">
-              <i class="fas fa-chevron-down"></i>
-            </span>
-          </div>
-
-          <!-- Level 2: API List (Accordion Content) -->
-          <div class="api-list accordion-content"
-               th:if="${service.apiGroupApiList != null and !service.apiGroupApiList.isEmpty()}"
-               th:classappend="${selected == service.id} ? 'expanded'">
-            <div class="api-item"
-                 th:each="api : ${service.apiGroupApiList}"
-                 th:data-api-id="${api.apiId}"
-                 th:classappend="${apiSpecInfo != null and apiSpecInfo.apiId == api.apiId} ? 'active'"
-                 th:attr="data-href=@{/apis/detail(id=${api.apiId})}">
-              <span class="api-name" th:text="${api.apiDesc}">API Name</span>
-            </div>
-          </div>
+        <!-- Service Categories -->
+        <div class="menu-section" th:each="service : ${services}">
+          <a class="menu-title"
+             th:classappend="${selected == service.id} ? 'active'"
+             th:href="@{/apis(groupIds=${service.id})}">
+            [[${service.groupName}]]
+          </a>
         </div>
       </nav>
     </aside>
@@ -183,7 +167,7 @@
       const mobileToggle = document.getElementById('mobileToggle');
       const mobileOverlay = document.getElementById('mobileOverlay');
 
-      // API Card Click Handlers
+      // API Card Click Handlers (if any exist)
       const apiCards = document.querySelectorAll('.api-card');
       apiCards.forEach(function(card) {
         // Click handler
@@ -206,57 +190,6 @@
         });
       });
 
-      // Level 2 API Item Click Handlers
-      const apiItems = document.querySelectorAll('.api-item');
-      apiItems.forEach(function(item) {
-        // Click handler
-        item.addEventListener('click', function(e) {
-          e.stopPropagation(); // Prevent parent menu-title click
-          const href = this.getAttribute('data-href');
-          if (href) {
-            window.location.href = href;
-          }
-        });
-
-        // Keyboard accessibility
-        item.addEventListener('keypress', function(e) {
-          if (e.key === 'Enter' || e.key === ' ') {
-            e.preventDefault();
-            e.stopPropagation();
-            const href = this.getAttribute('data-href');
-            if (href) {
-              window.location.href = href;
-            }
-          }
-        });
-      });
-
-      // Accordion Toggle Functionality
-      const accordionTriggers = document.querySelectorAll('.accordion-trigger');
-      accordionTriggers.forEach(function(trigger) {
-        trigger.addEventListener('click', function(e) {
-          e.preventDefault();
-
-          const menuSection = this.closest('.accordion-section');
-          const accordionContent = menuSection.querySelector('.accordion-content');
-
-          if (accordionContent) {
-            // Toggle expanded state
-            const isExpanded = this.classList.contains('expanded');
-
-            if (isExpanded) {
-              // Close this accordion
-              this.classList.remove('expanded');
-              accordionContent.classList.remove('expanded');
-            } else {
-              // Open this accordion
-              this.classList.add('expanded');
-              accordionContent.classList.add('expanded');
-            }
-          }
-        });
-      });
-
       // Mobile Menu Toggle
       if (mobileToggle && sidebar && mobileOverlay) {
         mobileToggle.addEventListener('click', function(e) {
diff --git a/src/main/resources/templates/views/apps/mypage/UserConversionCompleted.html b/src/main/resources/templates/views/apps/mypage/UserConversionCompleted.html
index 9102bfe..802035e 100644
--- a/src/main/resources/templates/views/apps/mypage/UserConversionCompleted.html
+++ b/src/main/resources/templates/views/apps/mypage/UserConversionCompleted.html
@@ -2,7 +2,7 @@
 <html xmlns="http://www.w3.org/1999/xhtml"
       xmlns:th="http://www.thymeleaf.org"
       xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
-      layout:decorate="~{layout/kbank_nohead_layout}">
+      layout:decorate="~{layout/kjbank_nohead_layout}">
 <body>
 <section layout:fragment="contentFragment" class="content pop">
     <div class="sub_title2">
diff --git a/src/main/resources/templates/views/apps/mypage/orgTransfer.html b/src/main/resources/templates/views/apps/mypage/orgTransfer.html
index d370511..f2fa206 100644
--- a/src/main/resources/templates/views/apps/mypage/orgTransfer.html
+++ b/src/main/resources/templates/views/apps/mypage/orgTransfer.html
@@ -90,11 +90,6 @@
                     compRegNo: $('#compRegNo').val().trim() !== '',
                     corpRegNo: $('#corpRegNo').val().trim() !== '',
                     orgName: $('#orgName').val().trim() !== '',
-                    ceoName: $('#ceoName').val().trim() !== '',
-                    orgAddr: $('#orgAddr').val().trim() !== '',
-                    orgPhoneNumber: $('#orgPhoneNumber').val().trim() !== '',
-                    scPhoneNumber: $('#scPhoneNumber').val().trim() !== '',
-                    serviceName: $('#serviceName').val().trim() !== '',
                     compRegFile: $('#compRegFile').val().trim() !== ''
                 };
 
@@ -104,11 +99,6 @@
                     compRegNo: '사업자등록번호를 입력해주세요.',
                     corpRegNo: '법인등록번호를 입력해주세요.',
                     orgName: '법인명을 입력해주세요.',
-                    ceoName: '대표자 성명을 입력해주세요.',
-                    orgAddr: '사업장 소재지를 입력해주세요.',
-                    orgPhoneNumber: '회사 전화번호를 입력해주세요.',
-                    scPhoneNumber: '고객센터 전화번호를 입력해주세요.',
-                    serviceName: '서비스명을 입력해주세요.',
                     compRegFile: '사업자등록증을 업로드해주세요.'
                 };
 
@@ -150,18 +140,12 @@
                     success: function(response) {
                         console.log('폼 제출 성공:', response);
 
-                        // 응답이 JSON인 경우
-                        if (typeof response === 'object') {
-                            if (response.status === 'SUCCESS') {
-                                customPopups.showSuccess(response.message || '법인회원 전환 신청이 완료되었습니다.', function() {
-                                    window.location.href = /*[[@{/mypage}]]*/ '/mypage';
-                                });
-                            } else {
-                                customPopups.showAlert(response.message || '처리 중 오류가 발생했습니다.');
-                            }
+                        if (response.status === 'SUCCESS') {
+                            customPopups.showAlert(response.message || '법인회원 전환 신청이 완료되었습니다.', function() {
+                                window.location.href = response.redirectUrl || /*[[@{/apps/mypage/UserConversionCompleted}]]*/ '/apps/mypage/UserConversionCompleted';
+                            });
                         } else {
-                            // 응답이 HTML인 경우 (페이지 리다이렉트)
-                            window.location.href = /*[[@{/mypage}]]*/ '/mypage';
+                            customPopups.showAlert(response.message || '처리 중 오류가 발생했습니다.');
                         }
                     },
                     error: function(xhr, status, error) {
diff --git a/src/main/resources/templates/views/apps/mypage/updatePersonalUser.html b/src/main/resources/templates/views/apps/mypage/updatePersonalUser.html
index 1ca3aa0..fbea85c 100644
--- a/src/main/resources/templates/views/apps/mypage/updatePersonalUser.html
+++ b/src/main/resources/templates/views/apps/mypage/updatePersonalUser.html
@@ -166,12 +166,14 @@
                 businessTransferBtn.addEventListener('click', () => {
                     customPopups.showConfirm(
                         '법인 회원으로 전환하시겠습니까?',
-                        () => {
-                            const transferForm = document.createElement('form');
-                            transferForm.method = 'GET';
-                            transferForm.action = '/mypage/org-transfer';
-                            document.body.appendChild(transferForm);
-                            transferForm.submit();
+                        (confirmed) => {
+                            if (confirmed) {
+                                const transferForm = document.createElement('form');
+                                transferForm.method = 'GET';
+                                transferForm.action = '/mypage/org-transfer';
+                                document.body.appendChild(transferForm);
+                                transferForm.submit();
+                            }
                         }
                     );
                 });
diff --git a/src/main/resources/templates/views/apps/register/emailValidationResultCorpManager.html b/src/main/resources/templates/views/apps/register/emailValidationResultCorpManager.html
index 811c731..c602649 100644
--- a/src/main/resources/templates/views/apps/register/emailValidationResultCorpManager.html
+++ b/src/main/resources/templates/views/apps/register/emailValidationResultCorpManager.html
@@ -2,7 +2,7 @@
 <html xmlns="http://www.w3.org/1999/xhtml"
       xmlns:th="http://www.thymeleaf.org"
       xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
-      layout:decorate="~{layout/kbank_nohead_layout}">
+      layout:decorate="~{layout/kjbank_nohead_layout}">
 <body>
 <section layout:fragment="contentFragment" class="content pop">
   <div class="sub_title2">
diff --git a/src/main/resources/templates/views/apps/register/emailValidationResultUser.html b/src/main/resources/templates/views/apps/register/emailValidationResultUser.html
index 05f75da..3dbec4d 100644
--- a/src/main/resources/templates/views/apps/register/emailValidationResultUser.html
+++ b/src/main/resources/templates/views/apps/register/emailValidationResultUser.html
@@ -2,7 +2,7 @@
 <html xmlns="http://www.w3.org/1999/xhtml"
       xmlns:th="http://www.thymeleaf.org"
       xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
-      layout:decorate="~{layout/kbank_nohead_layout}">
+      layout:decorate="~{layout/kjbank_nohead_layout}">
 <body>
 <section layout:fragment="contentFragment" class="content pop">
   <div class="sub_title2">
diff --git a/src/main/resources/templates/views/apps/register/joinCompleted.html b/src/main/resources/templates/views/apps/register/joinCompleted.html
index 5459d88..8e4ce46 100644
--- a/src/main/resources/templates/views/apps/register/joinCompleted.html
+++ b/src/main/resources/templates/views/apps/register/joinCompleted.html
@@ -2,7 +2,7 @@
 <html xmlns="http://www.w3.org/1999/xhtml"
       xmlns:th="http://www.thymeleaf.org"
       xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
-      layout:decorate="~{layout/kbank_nohead_layout}">
+      layout:decorate="~{layout/kjbank_nohead_layout}">
 <body>
 <section layout:fragment="contentFragment" class="content pop">
     <div class="sub_title2">