diff --git a/src/features/study/group/ui/group-study-form-modal.tsx b/src/features/study/group/ui/group-study-form-modal.tsx
index ff19a2dd..3f922ed7 100644
--- a/src/features/study/group/ui/group-study-form-modal.tsx
+++ b/src/features/study/group/ui/group-study-form-modal.tsx
@@ -87,11 +87,23 @@ export default function GroupStudyFormModal({
   const refineStudyDetail = (value: GroupStudyFullResponseDto) => {
     if (isLoading) return;
 
+    const refinedClassification =
+      value.basicInfo?.classification ?? classification;
+    const originalType = value.basicInfo?.type;
+
+    let refinedType = originalType;
+    if (
+      refinedClassification === 'GROUP_STUDY' &&
+      originalType === 'MENTORING'
+    ) {
+      refinedType = undefined;
+    }
+
     return {
-      classification: value.basicInfo?.classification ?? classification,
+      classification: refinedClassification,
       studyLeaderParticipation:
         value.basicInfo.studyLeaderParticipation ?? false,
-      type: value.basicInfo?.type,
+      type: refinedType,
       targetRoles: value.basicInfo?.targetRoles,
       maxMembersCount: value.basicInfo?.maxMembersCount?.toString() ?? '',
       experienceLevels: value.basicInfo?.experienceLevels,
diff --git a/src/features/study/group/ui/step/step1-group.tsx b/src/features/study/group/ui/step/step1-group.tsx
index 86e7006b..f25a7f25 100644
--- a/src/features/study/group/ui/step/step1-group.tsx
+++ b/src/features/study/group/ui/step/step1-group.tsx
@@ -1,13 +1,14 @@
 'use client';
 
 import { addDays } from 'date-fns';
+import { useEffect } from 'react';
 import {
   Controller,
   useController,
   useFormContext,
   useWatch,
 } from 'react-hook-form';
-import Checkbox from '@/components/ui/checkbox';
+
 import { SingleDropdown } from '@/components/ui/dropdown';
 import FormField from '@/components/ui/form/form-field';
 import { BaseInput } from '@/components/ui/input';
@@ -52,44 +53,20 @@ export default function Step1OpenGroupStudy() {
     name: 'regularMeeting',
     control,
   });
-  const { field: studyLeaderParticipationField } = useController({
-    name: 'studyLeaderParticipation',
-    control,
-  });
+
   const methodValue = useWatch({
     name: 'method',
     control,
   });
 
+  const filteredStudyTypes =
+    classification === 'GROUP_STUDY'
+      ? STUDY_TYPES.filter((type) => type !== 'MENTORING')
+      : STUDY_TYPES;
+
   return (
     <>
       <div className="font-designer-20b text-text-default">기본 정보 설정</div>
-      <FormField<GroupStudyFormValues, 'studyLeaderParticipation'>
-        name="studyLeaderParticipation"
-        label="리더 참여 여부"
-        helper="스터디 리더가 직접 스터디에 참여하는지 선택해주세요."
-        direction="vertical"
-        size="medium"
-        required
-      >
-        <div className="flex items-center gap-100">
-          <Checkbox
-            id="studyLeaderParticipation"
-            checked={studyLeaderParticipationField.value}
-            onToggle={() =>
-              studyLeaderParticipationField.onChange(
-                !studyLeaderParticipationField.value,
-              )
-            }
-          />
-          <label
-            htmlFor="studyLeaderParticipation"
-            className="font-designer-14m text-text-default cursor-pointer"
-          >
-            리더가 스터디에 참여합니다
-          </label>
-        </div>
-      </FormField>
       <FormField<GroupStudyFormValues, 'type'>
         name="type"
         label="스터디 유형"
@@ -103,14 +80,14 @@ export default function Step1OpenGroupStudy() {
           value={typeField.value}
           onValueChange={typeField.onChange}
         >
-          {STUDY_TYPES.map((type) => (
+          {filteredStudyTypes.map((type) => (
             <div key={type} className="flex items-center gap-100">
               <RadioGroupItem value={type} id={`study-type-${type}`} />
               <label
                 htmlFor={`study-type-${type}`}
                 className="font-designer-14m text-text-default"
               >
-                {STUDY_TYPE_LABELS[type]}
+                {STUDY_TYPE_LABELS[type as keyof typeof STUDY_TYPE_LABELS]}
               </label>
             </div>
           ))}