diff --git a/apps/mobile/src/app/auth/_components/authRegion/authRegion.tsx b/apps/mobile/src/app/auth/_components/authRegion/authRegion.tsx
index f25a9a7..f0a97ca 100644
--- a/apps/mobile/src/app/auth/_components/authRegion/authRegion.tsx
+++ b/apps/mobile/src/app/auth/_components/authRegion/authRegion.tsx
@@ -42,7 +42,28 @@ const AuthRegion = ({ handleNextStep, 대학교 }: AuthRegionProps) => {
 
   const handle회원가입 = () => {
     mutate(
-      { univName: 대학교, region: 지역검색키워드 },
+      {
+        univName: 대학교.length === 0 ? null : 대학교,
+        region: 지역검색키워드.length === 0 ? null : 지역검색키워드,
+      },
+      {
+        onSuccess: () => {
+          handleNextStep('completion');
+        },
+        onError: (error) => {
+          alert('회원가입에 실패했습니다. 다시 시도해주세요.');
+          console.error(error);
+        },
+      },
+    );
+  };
+
+  const handle건너뛰기 = () => {
+    mutate(
+      {
+        univName: 대학교.length === 0 ? null : 대학교,
+        region: null,
+      },
       {
         onSuccess: () => {
           handleNextStep('completion');
@@ -110,7 +131,7 @@ const AuthRegion = ({ handleNextStep, 대학교 }: AuthRegionProps) => {
             cancelText="취소"
             confirmText="확인"
             triggerText="건너뛰기"
-            onConfirm={() => handleNextStep('completion')}
+            onConfirm={handle건너뛰기}
           />
         </div>
       </div>
diff --git a/apps/mobile/src/app/auth/_components/authSchool/authSchool.tsx b/apps/mobile/src/app/auth/_components/authSchool/authSchool.tsx
index 5844d87..39ff4f3 100644
--- a/apps/mobile/src/app/auth/_components/authSchool/authSchool.tsx
+++ b/apps/mobile/src/app/auth/_components/authSchool/authSchool.tsx
@@ -100,6 +100,11 @@ const AuthSchool = ({ handleNextStep, handle대학교변경 }: AuthSchoolProps)
     );
   };
 
+  const handle건너뛰기 = () => {
+    handleNextStep('region');
+    handle대학교변경('');
+  };
+
   return (
     <div className={container}>
       <div className={topDivStyle}>
@@ -179,7 +184,7 @@ const AuthSchool = ({ handleNextStep, handle대학교변경 }: AuthSchoolProps)
             cancelText="취소"
             confirmText="확인"
             triggerText="건너뛰기"
-            onConfirm={() => handleNextStep('region')}
+            onConfirm={handle건너뛰기}
           />
         </div>
       </div>
diff --git a/apps/mobile/src/shared/apis/auth/types/index.ts b/apps/mobile/src/shared/apis/auth/types/index.ts
index 2cb31a7..8217acc 100644
--- a/apps/mobile/src/shared/apis/auth/types/index.ts
+++ b/apps/mobile/src/shared/apis/auth/types/index.ts
@@ -15,8 +15,8 @@ export namespace PostUnivValidate {
 
 export namespace PostAuthJoin {
   export interface Params {
-    univName: string;
-    region: string;
+    univName: string | null;
+    region: string | null;
   }
 }
 
diff --git a/apps/web/src/app/auth/_components/authRegion/authRegion.tsx b/apps/web/src/app/auth/_components/authRegion/authRegion.tsx
index 041d6ed..d018e79 100644
--- a/apps/web/src/app/auth/_components/authRegion/authRegion.tsx
+++ b/apps/web/src/app/auth/_components/authRegion/authRegion.tsx
@@ -56,6 +56,24 @@ const AuthRegion = ({ handleNextStep, 대학교 }: AuthRegionProps) => {
     );
   };
 
+  const handle건너뛰기 = () => {
+    mutate(
+      {
+        univName: 대학교.length === 0 ? null : 대학교,
+        region: null,
+      },
+      {
+        onSuccess: () => {
+          handleNextStep('completion');
+        },
+        onError: (error) => {
+          alert('회원가입에 실패했습니다. 다시 시도해주세요.');
+          console.error(error);
+        },
+      },
+    );
+  };
+
   return (
     <section className={sectionStyle}>
       <div>
@@ -115,7 +133,7 @@ const AuthRegion = ({ handleNextStep, 대학교 }: AuthRegionProps) => {
               cancelText="취소"
               confirmText="확인"
               triggerText="건너뛰기"
-              onConfirm={() => {}}
+              onConfirm={handle건너뛰기}
             />
           </div>
         </div>
diff --git a/apps/web/src/app/auth/_components/authSchool/authSchool.tsx b/apps/web/src/app/auth/_components/authSchool/authSchool.tsx
index 66c3672..52a478e 100644
--- a/apps/web/src/app/auth/_components/authSchool/authSchool.tsx
+++ b/apps/web/src/app/auth/_components/authSchool/authSchool.tsx
@@ -99,6 +99,11 @@ const AuthSchool = ({ handleNextStep, handle대학교변경 }: AuthSchoolProps)
     );
   };
 
+  const handle건너뛰기 = () => {
+    handleNextStep('region');
+    handle대학교변경('');
+  };
+
   return (
     <section className={sectionStyle}>
       <div>
@@ -175,7 +180,7 @@ const AuthSchool = ({ handleNextStep, handle대학교변경 }: AuthSchoolProps)
               cancelText="취소"
               confirmText="확인"
               triggerText="건너뛰기"
-              onConfirm={() => {}}
+              onConfirm={handle건너뛰기}
             />
           </div>
         </div>
diff --git a/apps/web/src/shared/apis/auth/types/index.ts b/apps/web/src/shared/apis/auth/types/index.ts
index 2cb31a7..8217acc 100644
--- a/apps/web/src/shared/apis/auth/types/index.ts
+++ b/apps/web/src/shared/apis/auth/types/index.ts
@@ -15,8 +15,8 @@ export namespace PostUnivValidate {
 
 export namespace PostAuthJoin {
   export interface Params {
-    univName: string;
-    region: string;
+    univName: string | null;
+    region: string | null;
   }
 }