diff --git a/src/api/user.ts b/src/api/user.ts
index 9624dab..8509d0e 100644
--- a/src/api/user.ts
+++ b/src/api/user.ts
@@ -88,3 +88,8 @@ export const getSubCategoryDetail = async (categoryId: number) => {
   const response = await axiosInstance.get(`/api/sub-categories/${categoryId}`)
   return response.data
 }
+
+export const terminateTaskUser = async (taskId: number, reason: string) => {
+  const response = await axiosInstance.patch(`/api/tasks/${taskId}/terminate`, { reason })
+  return response.data
+}
diff --git a/src/components/my-request/MyRequestList.vue b/src/components/my-request/MyRequestList.vue
index e8b4f0e..a15365a 100644
--- a/src/components/my-request/MyRequestList.vue
+++ b/src/components/my-request/MyRequestList.vue
@@ -7,7 +7,7 @@
     <template #listCards>
       <MyRequestListCard
         v-for="info in data?.content"
-        :key="info.taskStatus + info.processorName + info.taskId"
+        :key="info.taskStatus + info.processorName + info.taskId + info.title + info.categoryName"
         :info="info" />
       <NoContent v-if="data?.content.length === 0" />
     </template>
diff --git a/src/components/request-approve/RequestApprove.vue b/src/components/request-approve/RequestApprove.vue
index 89fd9b4..392fd09 100644
--- a/src/components/request-approve/RequestApprove.vue
+++ b/src/components/request-approve/RequestApprove.vue
@@ -75,6 +75,7 @@ import CategoryDropDown from '../request-task/CategoryDropDown.vue'
 import DueDateInput from './DueDateInput.vue'
 import LabelDropdown from './LabelDropdown.vue'
 import ManagerDropdown from './ManagerDropdown.vue'
+import getPossibleCategory from '@/utils/possibleCategory'
 
 const isModalVisible = ref(false)
 const category1 = ref<Category | null>(null)
@@ -119,7 +120,12 @@ onMounted(async () => {
     setError('존재하지 않는 요청입니다', '', () => redirectToLogin('/requested'))
     return
   }
-  mainCategoryArr.value = await getMainCategory()
+  const mainCategory = await getMainCategory()
+  const mainIds = await getPossibleCategory()
+  const filteredMainCategory = mainCategory.filter((category: Category) =>
+    mainIds.includes(category.mainCategoryId)
+  )
+  mainCategoryArr.value = filteredMainCategory
   subCategoryArr.value = await getSubCategory()
   const data = await getTaskDetailUser(requestId)
   const selected = mainCategoryArr.value.find(ct => ct.name === data.mainCategoryName) || null
diff --git a/src/components/request-task/ReRequestTask.vue b/src/components/request-task/ReRequestTask.vue
index 2cc9252..16cd168 100644
--- a/src/components/request-task/ReRequestTask.vue
+++ b/src/components/request-task/ReRequestTask.vue
@@ -27,6 +27,7 @@
       :limit-length="200" />
     <RequestTaskFileInput
       v-model="file"
+      :initFileArr="initFileArr"
       :isEdit="true" />
     <FormButtonContainer
       :handleCancel="handleCancel"
@@ -46,14 +47,26 @@
       <template #header>작업{{ statusText }}을 실패했습니다</template>
       <template #body>잠시후 시도해주세요</template>
     </ModalView>
+    <ModalView
+      :isOpen="isModalVisible === 'loading'"
+      type="loadingType">
+      <template #header>작업을 요청 중입니다...</template>
+      <template #body>잠시만 기다려주세요</template>
+    </ModalView>
   </div>
 </template>
 
 <script lang="ts" setup>
 import { getMainCategory, getSubCategory } from '@/api/common'
-import { getTaskDetailUser, patchTaskRequest, postTaskRequest } from '@/api/user'
+import {
+  getSubCategoryDetail,
+  getTaskDetailUser,
+  patchTaskRequest,
+  postTaskRequest
+} from '@/api/user'
 import type { Category, SubCategory } from '@/types/common'
 import type { AttachmentResponse } from '@/types/user'
+import getPossibleCategory from '@/utils/possibleCategory'
 import { computed, onMounted, ref, watch } from 'vue'
 import { useRouter } from 'vue-router'
 import FormButtonContainer from '../common/FormButtonContainer.vue'
@@ -91,7 +104,12 @@ const handleCancel = () => {
 }
 
 onMounted(async () => {
-  mainCategoryArr.value = await getMainCategory()
+  const mainCategory = await getMainCategory()
+  const mainIds = await getPossibleCategory()
+  const filteredMainCategory = mainCategory.filter((category: Category) =>
+    mainIds.includes(category.mainCategoryId)
+  )
+  mainCategoryArr.value = filteredMainCategory
   subCategoryArr.value = await getSubCategory()
   afterSubCategoryArr.value = await getSubCategory()
   const data = await getTaskDetailUser(Number(id))
@@ -103,6 +121,7 @@ onMounted(async () => {
   )
   title.value = data.title
   description.value = data.description
+
   file.value = data.attachmentResponses.map((attachment: AttachmentResponse) => {
     return new File([attachment.fileUrl], attachment.fileName, { type: 'application/pdf' })
   })
@@ -120,6 +139,13 @@ watch(category1, async newValue => {
   )
 })
 
+watch(category2, async newVal => {
+  if (newVal) {
+    const res = await getSubCategoryDetail(newVal.subCategoryId)
+    description.value = res.descriptionExample
+  }
+})
+
 const handleSubmit = async () => {
   if (isSubmitting.value || isModalVisible.value) return
 
@@ -140,11 +166,9 @@ const handleSubmit = async () => {
     return
   }
 
-  isSubmitting.value = true
-
   const formData = new FormData()
-
   isSubmitting.value = true
+  isModalVisible.value = 'loading'
 
   const attachmentsToDelete = initFileArr.value
     .filter(initFile => !file.value?.some(f => f.name === initFile.fileName))
@@ -161,7 +185,7 @@ const handleSubmit = async () => {
     attachmentsToDelete: attachmentsToDelete
   }
 
-  const jsonTaskInfo = JSON.stringify(taskInfoEdit)
+  const jsonTaskInfo = JSON.stringify(reqType === 'edit' ? taskInfoEdit : taskInfo)
   const newBlob = new Blob([jsonTaskInfo], { type: 'application/json' })
   formData.append('taskInfo', newBlob)
 
@@ -177,13 +201,16 @@ const handleSubmit = async () => {
       formData.append('attachment', f)
     })
   }
-
-  if (reqType === 're') {
-    await postTaskRequest(formData)
-  } else {
-    await patchTaskRequest(id, formData)
+  try {
+    if (reqType === 're') {
+      await postTaskRequest(formData)
+    } else {
+      await patchTaskRequest(id, formData)
+    }
+    isModalVisible.value = 'success'
+  } finally {
+    isSubmitting.value = false
+    if (isModalVisible.value !== 'success') isModalVisible.value = ''
   }
-  isModalVisible.value = 'success'
-  isSubmitting.value = false
 }
 </script>
diff --git a/src/components/request-task/RequestTask.vue b/src/components/request-task/RequestTask.vue
index 19d483f..7091923 100644
--- a/src/components/request-task/RequestTask.vue
+++ b/src/components/request-task/RequestTask.vue
@@ -52,6 +52,7 @@
 import { getMainCategory, getSubCategory } from '@/api/common'
 import { getSubCategoryDetail, postTaskRequest } from '@/api/user'
 import type { Category, SubCategory } from '@/types/common'
+import getPossibleCategory from '@/utils/possibleCategory'
 import { onMounted, ref, watch } from 'vue'
 import { useRouter } from 'vue-router'
 import FormButtonContainer from '../common/FormButtonContainer.vue'
@@ -79,7 +80,12 @@ const subCategoryArr = ref<SubCategory[]>([])
 const afterSubCategoryArr = ref<SubCategory[]>([])
 
 onMounted(async () => {
-  mainCategoryArr.value = await getMainCategory()
+  const mainCategory = await getMainCategory()
+  const mainIds = await getPossibleCategory()
+  const filteredMainCategory = mainCategory.filter((category: Category) =>
+    mainIds.includes(category.mainCategoryId)
+  )
+  mainCategoryArr.value = filteredMainCategory
   subCategoryArr.value = await getSubCategory()
   afterSubCategoryArr.value = await getSubCategory()
 })
@@ -147,9 +153,14 @@ const handleSubmit = async () => {
   if (file.value && file.value.length > 0) {
     file.value.forEach(f => formData.append('attachment', f))
   }
-  await postTaskRequest(formData)
-  isModalVisible.value = 'success'
-  isSubmitting.value = false
-  isUploading.value = false
+
+  try {
+    await postTaskRequest(formData)
+    isModalVisible.value = 'success'
+  } finally {
+    if (isModalVisible.value !== 'success') isModalVisible.value = ''
+    isSubmitting.value = false
+    isUploading.value = false
+  }
 }
 </script>
diff --git a/src/components/request-task/RequestTaskFileInput.vue b/src/components/request-task/RequestTaskFileInput.vue
index e4d8ac5..81ba9a8 100644
--- a/src/components/request-task/RequestTaskFileInput.vue
+++ b/src/components/request-task/RequestTaskFileInput.vue
@@ -11,7 +11,8 @@
       <RequestTaskFileInputAfter
         :files="modelValue"
         :isEdit
-        :removeFile="removeFile" />
+        :removeFile="removeFile"
+        :initFileArr="initFileArr" />
     </label>
     <div
       v-else
@@ -33,34 +34,42 @@
       </label>
     </div>
     <ModalView
-      :is-open="isModalVisible"
+      :is-open="isModalVisible === 'invalidate'"
       type="failType"
-      @close="handleModal">
+      @close="closeModal">
       <template #header>파일추가를 실패했습니다</template>
       <template #body>최대 5개, 각 5mb까지 가능합니다</template>
     </ModalView>
+    <ModalView
+      :is-open="isModalVisible === 'duplicated'"
+      type="failType"
+      @close="closeModal">
+      <template #header>중복된 파일입니다</template>
+    </ModalView>
   </div>
 </template>
 
 <script lang="ts" setup>
 import CommonIcons from '@/components/common/CommonIcons.vue'
 import { uploadIcon } from '@/constants/iconPath'
+import type { AttachmentResponse } from '@/types/user'
 import { computed, ref } from 'vue'
 import ModalView from '../common/ModalView.vue'
 import RequestTaskFileInputAfter from './RequestTaskFileInputAfter.vue'
 
-const { modelValue } = defineProps<{
+const { modelValue, isEdit, initFileArr } = defineProps<{
   modelValue: File[] | null
   isEdit?: boolean
+  initFileArr?: AttachmentResponse[]
 }>()
 const emit = defineEmits(['update:modelValue'])
 
 const hasFiles = computed(() => modelValue && modelValue.length > 0)
 const isDragging = ref(false)
-const isModalVisible = ref(false)
+const isModalVisible = ref('')
 
-const handleModal = () => {
-  isModalVisible.value = !isModalVisible.value
+const closeModal = () => {
+  isModalVisible.value = ''
 }
 
 const handleFileUpload = (event: Event) => {
@@ -76,12 +85,19 @@ const handleFileUpload = (event: Event) => {
       .filter(file => file !== null) as File[]
 
     if (newFiles.length !== target.files.length) {
-      handleModal()
+      isModalVisible.value = 'invalidate'
+      return
+    }
+
+    const existingFileNames = modelValue ? modelValue.map(file => file.name) : []
+    if (newFiles.some(file => existingFileNames.includes(file.name))) {
+      isModalVisible.value = 'duplicated'
       return
     }
+
     const updatedFiles = modelValue ? [...modelValue, ...newFiles] : newFiles
     if (updatedFiles.length > 5) {
-      handleModal()
+      isModalVisible.value = 'invalidate'
       return
     }
     emit('update:modelValue', updatedFiles.length === 1 ? [updatedFiles[0]] : updatedFiles)
@@ -101,13 +117,21 @@ const handleDrop = (event: DragEvent) => {
         return newFile.size <= 5 * 1024 * 1024 ? newFile : null
       })
       .filter(file => file !== null) as File[]
+
     if (newFiles.length !== files.length) {
-      handleModal()
+      isModalVisible.value = 'invalidate'
+      return
+    }
+
+    const existingFileNames = modelValue ? modelValue.map(file => file.name) : []
+    if (newFiles.some(file => existingFileNames.includes(file.name))) {
+      isModalVisible.value = 'duplicated'
       return
     }
+
     const updatedFiles = modelValue ? [...modelValue, ...newFiles] : newFiles
     if (updatedFiles.length > 5) {
-      handleModal()
+      isModalVisible.value = 'invalidate'
       return
     }
     emit('update:modelValue', updatedFiles.length === 1 ? [updatedFiles[0]] : updatedFiles)
diff --git a/src/components/request-task/RequestTaskFileInputAfter.vue b/src/components/request-task/RequestTaskFileInputAfter.vue
index 964433c..8a55590 100644
--- a/src/components/request-task/RequestTaskFileInputAfter.vue
+++ b/src/components/request-task/RequestTaskFileInputAfter.vue
@@ -19,7 +19,9 @@
           class="flex w-full justify-between items-center h-8 text-xs border-b border-b-border-2 px-4 shrink-0">
           <p class="flex truncate mr-3">{{ file.name }}</p>
           <div class="flex gap-6">
-            <p class="w-[60px]">{{ isEdit ? file.size : formatFileSize(file.size) }}</p>
+            <p class="w-[60px]">
+              {{ isEdit ? getFileSizeByName(file.name, file.size) : formatFileSize(file.size) }}
+            </p>
             <p class="w-36">{{ new Date().toLocaleString() }}</p>
             <div class="w-10 flex items-center justify-center cursor-pointer">
               <CommonIcons
@@ -47,5 +49,10 @@ import type { RequestTaskFileInputProps } from '@/types/user'
 import { formatFileSize } from '@/utils/unit'
 import CommonIcons from '../common/CommonIcons.vue'
 
-const { files, removeFile, isEdit } = defineProps<RequestTaskFileInputProps>()
+const { files, removeFile, isEdit, initFileArr } = defineProps<RequestTaskFileInputProps>()
+
+const getFileSizeByName = (fileName: string, size: number): string | number => {
+  const file = initFileArr?.find(file => file.fileName === fileName)
+  return file ? file.fileSize : formatFileSize(size)
+}
 </script>
diff --git a/src/components/requested/RequestedListCard.vue b/src/components/requested/RequestedListCard.vue
index 3d0e710..9aa6c48 100644
--- a/src/components/requested/RequestedListCard.vue
+++ b/src/components/requested/RequestedListCard.vue
@@ -35,14 +35,14 @@
     :is-open="isModalVisible.reject"
     @update:model-value="value => (rejectReason = value || '')"
     type="inputType"
-    @close="closeModal"
+    @close="closeAllModal"
     @click="rejectRequest">
     <template #header>반려 사유를 입력해주세요</template>
   </ModalView>
   <ModalView
     :is-open="isModalVisible.success"
     type="successType"
-    @close="closeModal">
+    @close="closeAllModal">
     <template #header>반려가 완료되었습니다</template>
   </ModalView>
   <ModalView
@@ -75,13 +75,6 @@ const requestedTabList: ListCardProps[] = [
   { content: info.title },
   { content: info.requesterName, width: 120, profileImg: info.requesterImg }
 ]
-
-const selectedID = ref<number | null>(null)
-
-const handleModal = (id: number | null) => {
-  selectedID.value = id
-}
-
 const router = useRouter()
 const queryClient = useQueryClient()
 
@@ -90,24 +83,38 @@ const isModalVisible = ref({
   fail: false,
   success: false
 })
+const backModal = ref(false)
 const modalError = ref('')
 const rejectReason = ref('')
+const selectedID = ref<number | null>(null)
+
+const handleModal = (id: number | null) => {
+  selectedID.value = id
+}
+
 const toggleModal = (key: keyof typeof isModalVisible.value) => {
   isModalVisible.value = Object.fromEntries(
     Object.keys(isModalVisible.value).map(k => [k, k === key])
   ) as typeof isModalVisible.value
 }
 const closeModal = () => {
+  isModalVisible.value = { reject: backModal.value ? true : false, fail: false, success: false }
+}
+
+const closeAllModal = () => {
   const prevSuccess = isModalVisible.value.success
   isModalVisible.value = { reject: false, fail: false, success: false }
   if (prevSuccess) queryClient.invalidateQueries({ queryKey: ['requested'] })
 }
+
 const rejectRequest = async () => {
   if (rejectReason.value.length === 0) {
     toggleModal('fail')
     modalError.value = '반려 사유를 입력해주세요'
+    backModal.value = true
     return
   }
+  backModal.value = false
   await axiosInstance.patch(`/api/tasks/${info.taskId}/terminate`, {
     reason: DOMPurify.sanitize(rejectReason.value)
   })
diff --git a/src/components/task-detail/TaskDetailHistory.vue b/src/components/task-detail/TaskDetailHistory.vue
index 85e18f8..9b31707 100644
--- a/src/components/task-detail/TaskDetailHistory.vue
+++ b/src/components/task-detail/TaskDetailHistory.vue
@@ -5,10 +5,9 @@
       :history="historyData"
       :taskId="taskId"
       :requestor-name="requestorName" />
-
-    <div class="flex flex-col w-full items-center mt-8 gap-[22px]">
+    <div class="flex flex-col w-full items-center mt-8 gap-6">
       <div
-        class="flex w-full flex-col items-center gap-[22px]"
+        class="flex w-full flex-col items-center gap-6"
         v-for="(item, i) in historyData"
         :key="item.historyId">
         <div
@@ -22,19 +21,15 @@
             class="text-xs font-semibold text-body">
             {{ formatTimeShort(item.time) }}
           </div>
-          <div class="flex w-full gap-1 justify-center text-body text-sm">
+          <div
+            v-if="
+              item.taskHistoryType === 'STATUS_SWITCHED' ||
+              item.taskHistoryType === 'PROCESSOR_CHANGED' ||
+              item.taskHistoryType === 'PROCESSOR_ASSIGNED'
+            "
+            class="flex w-full gap-1 justify-center text-body text-sm">
             <p>{{ HistoryMessageBefore[item.taskHistoryType] }}</p>
-            <p
-              v-if="item.taskHistoryType === 'STATUS_SWITCHED'"
-              class="text-primary1">
-              {{ item.details.taskDetails?.value }}
-            </p>
-            <p
-              v-else-if="
-                item.taskHistoryType === 'PROCESSOR_CHANGED' ||
-                item.taskHistoryType === 'PROCESSOR_ASSIGNED'
-              "
-              class="text-primary1">
+            <p class="text-primary1">
               {{ item.details.taskDetails?.value }}
             </p>
             <p>{{ HistoryMessageAfter[item.taskHistoryType] }}</p>
diff --git a/src/components/task-detail/TaskDetailHistoryChat.vue b/src/components/task-detail/TaskDetailHistoryChat.vue
index d822386..8497cdb 100644
--- a/src/components/task-detail/TaskDetailHistoryChat.vue
+++ b/src/components/task-detail/TaskDetailHistoryChat.vue
@@ -18,7 +18,7 @@
       <div :class="['flex gap-2', isRequestor ? 'flex-row' : 'flex-row-reverse']">
         <p
           :class="[
-            'flex max-w-[400px] flex-wrap break-all px-4 py-3 text-base rounded-lg font-normal',
+            'flex max-w-[400px] flex-wrap break-all whitespace-pre-wrap px-4 py-3 text-sm rounded-lg font-normal',
             isRequestor ? 'bg-background-2' : 'bg-primary2'
           ]">
           {{ history.details.commentDetails?.comment || history.details.taskDetails?.value }}
diff --git a/src/components/task-detail/TaskDetailHistoryFile.vue b/src/components/task-detail/TaskDetailHistoryFile.vue
index 0186509..0aa0275 100644
--- a/src/components/task-detail/TaskDetailHistoryFile.vue
+++ b/src/components/task-detail/TaskDetailHistoryFile.vue
@@ -13,7 +13,7 @@
       <p class="text-xs text-body">{{ history.details.commentFileDetails?.nickName }}</p>
       <div :class="['flex gap-2', isRequestor ? 'flex-row' : 'flex-row-reverse']">
         <div
-          class="flex max-w-[400px] px-4 py-3 gap-4 items-center rounded-lg"
+          class="flex max-w-[400px] px-4 py-3 gap-3 items-center rounded-lg"
           :class="isRequestor ? 'bg-background-2' : 'bg-primary2'">
           <a
             class="w-10 h-10 flex items-center justify-center bg-white border border-border-2 rounded-lg shrink-0 hover:bg-primary2"
@@ -21,8 +21,8 @@
             download>
             <CommonIcons :name="fileIcon" />
           </a>
-          <div class="flex flex-col gap-2 flex-1 min-w-0">
-            <p class="font-normal w-full overflow-hidden whitespace-nowrap text-ellipsis">
+          <div class="flex flex-col gap-1 flex-1 min-w-0">
+            <p class="font-normal w-full overflow-hidden whitespace-nowrap text-ellipsis text-sm">
               {{ history.details.commentFileDetails?.fileName }}
             </p>
             <p class="text-xs font-semibold text-body">
diff --git a/src/components/task-detail/TaskDetailHistoryInput.vue b/src/components/task-detail/TaskDetailHistoryInput.vue
index 415d02e..134f5d5 100644
--- a/src/components/task-detail/TaskDetailHistoryInput.vue
+++ b/src/components/task-detail/TaskDetailHistoryInput.vue
@@ -103,8 +103,10 @@ const handleModal = () => {
   isModalVisible.value = !isModalVisible.value
 }
 
-const handleEnterKey = () => {
-  if (!isComposing.value) {
+const handleEnterKey = (event: KeyboardEvent) => {
+  if (event.shiftKey) {
+    messageText.value += '\n'
+  } else if (!isComposing.value) {
     sendMessage()
   }
 }
diff --git a/src/components/task-detail/TaskDetailManagerDropdown.vue b/src/components/task-detail/TaskDetailManagerDropdown.vue
index 5778f17..3af5154 100644
--- a/src/components/task-detail/TaskDetailManagerDropdown.vue
+++ b/src/components/task-detail/TaskDetailManagerDropdown.vue
@@ -9,8 +9,8 @@
         <ImageContainer
           :url="modelValue?.imageUrl"
           :size="20" />
-        <p>
-          {{ modelValue?.nickname }}
+        <p :class="['text-sm', { 'text-disabled': !modelValue?.nickname }]">
+          {{ modelValue?.nickname || '담당자를 선택해주세요' }}
         </p>
       </div>
       <CommonIcons
@@ -25,7 +25,7 @@
         :key="option.memberId"
         class="request-task-dropdown-option justify-between"
         @click="selectOption(option)">
-        <div class="flex gap-2">
+        <div class="flex gap-2 items-center text-sm">
           <ImageContainer
             :url="option.imageUrl"
             :size="20" />
@@ -50,6 +50,7 @@ import ImageContainer from '../common/ImageContainer.vue'
 
 const { modelValue } = defineProps<{ modelValue: ManagerTypes; taskId: number }>()
 const emit = defineEmits(['update:modelValue'])
+console.log(modelValue,'현재 담당자' )
 
 const dropdownOpen = ref(false)
 const managerArr = ref<ManagerTypes[]>([])
diff --git a/src/components/task-detail/TaskDetailTopBar.vue b/src/components/task-detail/TaskDetailTopBar.vue
index 73fa368..6738523 100644
--- a/src/components/task-detail/TaskDetailTopBar.vue
+++ b/src/components/task-detail/TaskDetailTopBar.vue
@@ -15,6 +15,13 @@
         <CommonIcons :name="modificationIcon" />
         <p class="text-primary1">요청 수정</p>
       </div>
+      <div
+        @click="toggleModal('cancel')"
+        v-if="!isApproved && isRequestor"
+        class="flex gap-1 items-center cursor-pointer p-1 hover:bg-background-2 rounded">
+        <CommonIcons :name="cancelIcon" />
+        <p class="text-red-1">요청 취소</p>
+      </div>
       <div
         @click="onButtonClick(`/request-approve?requestId=${id}`)"
         v-if="isReviewer && !isApproved"
@@ -23,11 +30,13 @@
         <p class="text-primary1">요청 승인</p>
       </div>
       <div
-        @click="toggleModal('cancel')"
-        v-if="!isApproved && isRequestor"
+        @click="toggleModal('reject')"
+        v-if="!isApproved && isReviewer"
         class="flex gap-1 items-center cursor-pointer p-1 hover:bg-background-2 rounded">
-        <CommonIcons :name="cancelIcon" />
-        <p class="text-red-1">요청 취소</p>
+        <CommonIcons
+          :name="reRequestIcon"
+          :style="{ fill: '#dc2626' }" />
+        <p class="text-red-1">요청 반려</p>
       </div>
     </div>
     <button
@@ -47,14 +56,28 @@
     <ModalView
       :is-open="isModalOpen.success"
       type="successType"
-      @close="finishCancel">
-      <template #header>요청이 취소되었습니다</template>
+      @close="closeAllModal">
+      <template #header>{{ modalSuccessMessage }}</template>
+    </ModalView>
+    <ModalView
+      :is-open="isModalOpen.reject"
+      @update:model-value="value => (rejectReason = value || '')"
+      type="inputType"
+      @close="closeAllModal"
+      @click="rejectRequest">
+      <template #header>반려 사유를 입력해주세요</template>
+    </ModalView>
+    <ModalView
+      :is-open="isModalOpen.fail"
+      type="failType"
+      @close="closeErrorModal">
+      <template #header>{{ modalError }}</template>
     </ModalView>
   </div>
 </template>
 
 <script setup lang="ts">
-import { cancelTaskUser } from '@/api/user'
+import { cancelTaskUser, terminateTaskUser } from '@/api/user'
 import {
   approveIcon,
   cancelIcon,
@@ -63,44 +86,77 @@ import {
   reRequestIcon
 } from '@/constants/iconPath'
 import type { TaskDetailTopBarProps } from '@/types/manager'
+import { useQueryClient } from '@tanstack/vue-query'
 import { ref } from 'vue'
 import { useRouter } from 'vue-router'
 import CommonIcons from '../common/CommonIcons.vue'
+import ModalView from '../common/ModalView.vue'
 
 const router = useRouter()
 const { isApproved, closeTaskDetail, id, isReviewer, isRequestor } =
   defineProps<TaskDetailTopBarProps>()
 
-import { useQueryClient } from '@tanstack/vue-query'
-import ModalView from '../common/ModalView.vue'
-
 const queryClient = useQueryClient()
-
+const backModal = ref(false)
+const modalSuccessMessage = ref('')
+const modalError = ref('')
+const rejectReason = ref('')
 const isModalOpen = ref({
   cancel: false,
-  success: false
+  success: false,
+  reject: false,
+  fail: false
 })
 
 const toggleModal = (key: keyof typeof isModalOpen.value) => {
-  isModalOpen.value[key] = !isModalOpen.value[key]
+  isModalOpen.value = Object.fromEntries(
+    Object.keys(isModalOpen.value).map(k => [k, k === key])
+  ) as typeof isModalOpen.value
 }
 
 const closeCancelModal = () => {
   isModalOpen.value.cancel = false
 }
 
+const closeErrorModal = () => {
+  isModalOpen.value = {
+    reject: backModal.value ? true : false,
+    fail: false,
+    success: false,
+    cancel: false
+  }
+}
+
+const closeAllModal = async () => {
+  const prevSuccess = isModalOpen.value.success
+  isModalOpen.value = { reject: false, cancel: false, success: false, fail: false }
+  await queryClient.refetchQueries({
+    queryKey: ['myRequest']
+  })
+  if (prevSuccess) queryClient.invalidateQueries({ queryKey: ['requested'] })
+}
+
 const cancelTask = async () => {
   await cancelTaskUser(id)
+  modalSuccessMessage.value = '요청이 취소되었습니다'
   toggleModal('cancel')
   toggleModal('success')
 }
 
-const finishCancel = async () => {
-  await queryClient.refetchQueries({
-    queryKey: ['myRequest']
-  })
+const rejectRequest = async () => {
+  rejectReason.value = rejectReason.value.trim()
+  if (rejectReason.value.length === 0) {
+    toggleModal('fail')
+    modalError.value = '반려 사유를 입력해주세요'
+    backModal.value = true
+    return
+  }
+  backModal.value = false
+  await terminateTaskUser(id, rejectReason.value)
+  modalSuccessMessage.value = '요청이 반려되었습니다'
   toggleModal('success')
-  closeTaskDetail()
+  queryClient.invalidateQueries({ queryKey: ['taskDetailUser', id] })
+  queryClient.invalidateQueries({ queryKey: ['historyData', id] })
 }
 
 const onButtonClick = (url: string) => {
diff --git a/src/components/task-detail/TaskStatusList.vue b/src/components/task-detail/TaskStatusList.vue
index efd6ff5..1dd7762 100644
--- a/src/components/task-detail/TaskStatusList.vue
+++ b/src/components/task-detail/TaskStatusList.vue
@@ -75,9 +75,7 @@ const toggleModal = (key: keyof typeof isModalVisible.value) => {
 }
 
 const closeModal = () => {
-  const prevSuccess = isModalVisible.value.success
   isModalVisible.value = { reject: backModal.value ? true : false, fail: false, success: false }
-  if (prevSuccess) queryClient.invalidateQueries({ queryKey: ['requested'] })
 }
 
 const closeAllModal = () => {
@@ -103,7 +101,6 @@ const rejectRequest = async () => {
     backModal.value = true
     return
   }
-
   backModal.value = false
   await axiosInstance.patch(`/api/tasks/${taskId}/terminate`, {
     reason: DOMPurify.sanitize(rejectReason.value)
diff --git "a/src/components/user-manage/\bDisabledInput.vue" "b/src/components/user-manage/\bDisabledInput.vue"
new file mode 100644
index 0000000..a375eb0
--- /dev/null
+++ "b/src/components/user-manage/\bDisabledInput.vue"
@@ -0,0 +1,19 @@
+<template>
+  <div class="relative w-full">
+    <div class="text-xs flex gap-x-1 mb-2 text-body font-semibold">
+      {{ labelName }}
+      <p class="text-red-1">*</p>
+    </div>
+    <div
+      class="w-full h-11 border px-4 border-border-1 rounded text-disabled bg-background-2 flex items-center">
+      {{ value }}
+    </div>
+  </div>
+</template>
+
+<script lang="ts" setup>
+defineProps<{
+  labelName: string
+  value: string
+}>()
+</script>
diff --git a/src/components/user-manage/UserUpdate.vue b/src/components/user-manage/UserUpdate.vue
index 667709e..6c0fed4 100644
--- a/src/components/user-manage/UserUpdate.vue
+++ b/src/components/user-manage/UserUpdate.vue
@@ -8,30 +8,16 @@
         :limit-length="10"
         :labelName="'이름'" />
     </div>
-    <RequestTaskInput
-      v-model="userRegistrationForm.nickname"
-      :placeholderText="'회원의 아이디를 입력해주세요'"
-      :isEdit="true"
-      :is-invalidate="
-        isInvalidate === 'nicknameEmpty'
-          ? 'empty'
-          : isInvalidate === 'wrongNickname'
-            ? isInvalidate
-            : ''
-      "
-      :labelName="'아이디'" />
+    <DisabledInput
+      :label-name="'아이디'"
+      :value="userRegistrationForm.nickname" />
     <div class="flex w-full gap-2">
-      <RequestTaskInput
-        v-model="userRegistrationForm.nickname"
-        :is-edit="true"
-        :placeholderText="'이메일은 아이디와 동일합니다'"
-        :labelName="'이메일'" />
-      <RequestTaskInput
-        v-model="userRegistrationForm.email"
-        :placeholderText="'@kakao.com'"
+      <DisabledInput
+        :label-name="'이메일'"
+        :value="userRegistrationForm.nickname" />
+      <DisabledInput
         :label-name="'도메인'"
-        :is-edit="true"
-        :is-not-required="false" />
+        :value="userRegistrationForm.email" />
     </div>
     <DepartmentDropDown
       v-model="userRegistrationForm.department"
@@ -83,6 +69,7 @@ import {
   RoleTypeMapping
 } from '@/constants/admin'
 import type { UserRegistrationProps } from '@/types/admin'
+import DOMPurify from 'dompurify'
 import { computed, onMounted, ref, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import FormButtonContainer from '../common/FormButtonContainer.vue'
@@ -90,15 +77,12 @@ import FormCheckbox from '../common/FormCheckbox.vue'
 import ModalView from '../common/ModalView.vue'
 import RequestTaskDropdown from '../request-task/RequestTaskDropdown.vue'
 import RequestTaskInput from '../request-task/RequestTaskInput.vue'
+import DisabledInput from './\bDisabledInput.vue'
 import DepartmentDropDown from './DepartmentDropDown.vue'
-import DOMPurify from 'dompurify'
 
 const route = useRoute()
 const router = useRouter()
 
-const usernameRegex = /^[a-z]{3,10}\.[a-z]{1,5}$/
-const emailRegex = /^@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)+$/
-
 const userRegistrationForm = ref(INITIAL_USER_REGISTRATION)
 const isInvalidate = ref('')
 const userId = ref(route.query.id)
@@ -159,18 +143,6 @@ const handleSubmit = async () => {
       isInvalidate.value = 'nameEmpty'
       return
     }
-    if (!userRegistrationForm.value.nickname) {
-      isInvalidate.value = 'nicknameEmpty'
-      return
-    }
-    if (!usernameRegex.test(userRegistrationForm.value.nickname)) {
-      isInvalidate.value = 'wrongNickname'
-      return
-    }
-    if (!emailRegex.test(userRegistrationForm.value.email)) {
-      isInvalidate.value = 'wrongEmail'
-      return
-    }
     if (!userRegistrationForm.value.department?.departmentId) {
       isInvalidate.value = 'departmentEmpty'
       return
@@ -191,7 +163,6 @@ const handleSubmit = async () => {
         departmentId: userRegistrationForm.value.department.departmentId,
         departmentRole: userRegistrationForm.value.departmentRole
       }
-
       await updateMemberAdmin(userId.value, formData)
       isModalVisible.value = 'success'
     }
diff --git a/src/types/user.ts b/src/types/user.ts
index ff25da4..d5c8bd3 100644
--- a/src/types/user.ts
+++ b/src/types/user.ts
@@ -39,6 +39,7 @@ export interface RequestTaskFileInputProps {
   files: File[] | null
   removeFile: (index: number) => void
   isEdit?: boolean
+  initFileArr?: AttachmentResponse[]
 }
 
 export interface RequestTaskTextAreaProps {
diff --git a/src/utils/possibleCategory.ts b/src/utils/possibleCategory.ts
new file mode 100644
index 0000000..1c9d72a
--- /dev/null
+++ b/src/utils/possibleCategory.ts
@@ -0,0 +1,17 @@
+import { getCategory } from '@/api/common'
+import type { Category } from '@/types/common'
+import { ref } from 'vue'
+
+const getPossibleCategory = async (): Promise<number[]> => {
+  const categories = ref<Category[]>([])
+  const possibleCategory = await getCategory()
+  categories.value = possibleCategory
+
+  const mainCategoryIds = categories.value
+    .filter(category => category.subCategory && category.subCategory.length > 0)
+    .map(category => category.mainCategoryId)
+
+  return mainCategoryIds
+}
+
+export default getPossibleCategory