diff --git a/frontend/src/features/system/pages/CommonCodeManagementPage.vue b/frontend/src/features/system/pages/CommonCodeManagementPage.vue
index f9549c4c..364ec6cc 100644
--- a/frontend/src/features/system/pages/CommonCodeManagementPage.vue
+++ b/frontend/src/features/system/pages/CommonCodeManagementPage.vue
@@ -236,11 +236,11 @@ const saveMasterBatch = () => {
 // Inline Child Code Grid Editing Handlers (Top-Row Insertion)
 const addGridRow = () => {
   const groupCodeKey = selectedGroupCode.value.groupCode
-  let list = mockChildCodesMap[groupCodeKey]
-  if (!list) {
-    list = []
-    Object.assign(mockChildCodesMap, { [groupCodeKey]: list })
+  if (!mockChildCodesMap[groupCodeKey]) {
+    mockChildCodesMap[groupCodeKey] = reactive<CommonCode[]>([])
   }
+  const list = mockChildCodesMap[groupCodeKey]
+
   const newRow: CommonCode = {
     code: `NEW_CODE_${list.length + 1}`,
     codeName: '새 코드명',
@@ -256,7 +256,11 @@ const addGridRow = () => {
   selectedGroupCode.value.codeCount = list.length
 
   nextTick(() => {
-    detailGridRef.value?.focusRow(0, 'code')
+    try {
+      detailGridRef.value?.focusRow?.(0, 'code')
+    } catch (e) {
+      console.warn('focusRow not available', e)
+    }
   })
 }
 
diff --git a/frontend/src/shared/ui/components/KsDataGrid.vue b/frontend/src/shared/ui/components/KsDataGrid.vue
index 7b032a3d..a8ee15d1 100644
--- a/frontend/src/shared/ui/components/KsDataGrid.vue
+++ b/frontend/src/shared/ui/components/KsDataGrid.vue
@@ -1,22 +1,63 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 import { AgGridVue } from 'ag-grid-vue3'
-import { ClientSideRowModelModule, ColumnAutoSizeModule, CellStyleModule, ValidationModule, ModuleRegistry, RowSelectionModule, TextFilterModule, themeQuartz, type ColDef, type RowClickedEvent } from 'ag-grid-community'
+import {
+  ClientSideRowModelModule,
+  ColumnAutoSizeModule,
+  CellStyleModule,
+  ValidationModule,
+  TextFilterModule,
+  TextEditorModule,
+  NumberEditorModule,
+  SelectEditorModule,
+  UndoRedoEditModule,
+  RowStyleModule,
+  RenderApiModule,
+  ModuleRegistry,
+  RowSelectionModule,
+  ScrollApiModule,
+  themeQuartz,
+  type ColDef,
+  type RowClickedEvent,
+  type CellValueChangedEvent,
+  type RowClassParams
+} from 'ag-grid-community'
 import type { UiGridColumn } from '../adapter/contracts'
 
-ModuleRegistry.registerModules([ClientSideRowModelModule, ColumnAutoSizeModule, CellStyleModule, ValidationModule, TextFilterModule, RowSelectionModule])
+ModuleRegistry.registerModules([
+  ClientSideRowModelModule,
+  ColumnAutoSizeModule,
+  CellStyleModule,
+  ValidationModule,
+  TextFilterModule,
+  TextEditorModule,
+  NumberEditorModule,
+  SelectEditorModule,
+  UndoRedoEditModule,
+  RowStyleModule,
+  RenderApiModule,
+  RowSelectionModule,
+  ScrollApiModule
+])
 
-const emit = defineEmits<{ rowSelected: [row: unknown] }>()
+
+
+const emit = defineEmits<{ rowSelected: [row: unknown]; cellValueChanged: [event: CellValueChangedEvent] }>()
 const props = withDefaults(defineProps<{ rows: unknown[]; columns: UiGridColumn[]; loading?: boolean; height?: string; rowSelection?: 'single' | 'multiple' | 'none'; showRowNumber?: boolean }>(), { loading: false, height: '32rem', rowSelection: 'single', showRowNumber: true })
+
 const columnDefs = computed<ColDef[]>(() => {
   const mappedCols: ColDef[] = props.columns.map(column => ({
     field: column.field,
     headerName: column.header,
     width: column.width,
     minWidth: column.minWidth ?? 80,
+    maxWidth: column.maxWidth,
     flex: column.flex ?? (column.width ? undefined : 1),
+
     sortable: column.sortable ?? true,
-    filter: column.filterable ?? true,
+    filter: column.filterable ?? false,
+    editable: column.editable ?? false,
+
     valueFormatter: column.formatter ? params => column.formatter?.(params.value, params.data) ?? '' : undefined
   }))
 
@@ -32,6 +73,7 @@ const columnDefs = computed<ColDef[]>(() => {
       sortable: false,
       filter: false,
       resizable: false,
+      editable: false,
       cellStyle: { textAlign: 'center', color: 'var(--ks-color-neutral-600)', fontSize: '11px' },
       headerClass: 'ks-row-number-header'
     }
@@ -40,35 +82,204 @@ const columnDefs = computed<ColDef[]>(() => {
 
   return mappedCols
 })
-const rowSelectionOptions = computed(() => props.rowSelection === 'none' ? undefined : ({ mode: props.rowSelection === 'multiple' ? 'multiRow' : 'singleRow' } as const))
+
+const rowClassRules = computed(() => ({
+  'ks-row-added': (params: RowClassParams) => {
+    const data = params.data as Record<string, unknown> | undefined
+    if (!data) return false
+    return !!(data._isNew || (typeof data.code === 'string' && data.code.startsWith('NEW_')) || (typeof data.groupCode === 'string' && data.groupCode.startsWith('NEW_')))
+  },
+  'ks-row-modified': (params: RowClassParams) => {
+    const data = params.data as Record<string, unknown> | undefined
+    return data?._isModified === true
+  }
+}))
+
+const rowSelectionOptions = computed(() => {
+  if (props.rowSelection === 'none') return undefined
+  if (props.rowSelection === 'multiple') return { mode: 'multiRow' } as const
+  return { mode: 'singleRow', checkboxes: false, enableClickSelection: true } as const
+})
+
 function onRowClicked(event: RowClickedEvent): void {
   if (event.data) emit('rowSelected', event.data)
 }
+
+function onCellValueChanged(event: CellValueChangedEvent): void {
+  if (event.data) {
+    (event.data as Record<string, unknown>)._isModified = true
+    emit('cellValueChanged', event)
+  }
+}
+
 function onSortChanged(params: { api: { redrawRows: () => void; refreshCells: (options: { force: boolean }) => void } }): void {
   params.api.redrawRows()
 }
-function onGridReady(params: { api: { sizeColumnsToFit: () => void } }): void {
+
+import { ref, onMounted, onUnmounted } from 'vue'
+import type { GridApi, GridReadyEvent } from 'ag-grid-community'
+
+const gridApi = ref<GridApi | null>(null)
+
+function handleResize() {
+  gridApi.value?.sizeColumnsToFit()
+}
+
+onMounted(() => {
+  window.addEventListener('resize', handleResize)
+})
+
+onUnmounted(() => {
+  window.removeEventListener('resize', handleResize)
+})
+
+function onGridReady(params: GridReadyEvent): void {
+  gridApi.value = params.api
   params.api.sizeColumnsToFit()
 }
+
+
+
+
+function focusRow(rowIndex: number, colKey?: string): void {
+  if (!gridApi.value) return
+  const col = colKey || (props.columns[0]?.field ?? '')
+
+  const attempt = () => {
+    if (!gridApi.value) return
+    gridApi.value.ensureIndexVisible(rowIndex)
+    if (col) {
+      gridApi.value.setFocusedCell(rowIndex, col)
+      gridApi.value.startEditingCell({ rowIndex, colKey: col })
+    }
+  }
+
+  attempt()
+  setTimeout(attempt, 50)
+  setTimeout(attempt, 150)
+}
+
+
+import type { NavigateToNextCellParams, CellPosition, CellEditingStoppedEvent } from 'ag-grid-community'
+
+
+
+function navigateToNextCell(params: NavigateToNextCellParams): CellPosition | null {
+  const previousCell = params.previousCellPosition
+  const suggestedNextCell = params.nextCellPosition
+
+  if (params.key === 'Enter' || String(params.key) === '13') {
+    const allColumns = params.api.getAllGridColumns()
+    const editableCols = allColumns.filter(c => {
+      const colDef = c.getColDef()
+      return colDef.editable === true || typeof colDef.editable === 'function'
+    })
+
+    if (editableCols.length > 0) {
+      const currentColId = previousCell.column.getColId()
+      const currentIndex = editableCols.findIndex(c => c.getColId() === currentColId)
+
+      if (currentIndex >= 0 && currentIndex < editableCols.length - 1) {
+        const nextCol = editableCols[currentIndex + 1]
+        const colId = nextCol.getColId()
+        setTimeout(() => {
+          params.api.startEditingCell({ rowIndex: previousCell.rowIndex, colKey: colId })
+        }, 30)
+        return {
+          rowIndex: previousCell.rowIndex,
+          column: nextCol,
+          rowPinned: previousCell.rowPinned
+        }
+      } else {
+        const nextRowIndex = previousCell.rowIndex + 1
+        const firstCol = editableCols[0]
+        const colId = firstCol.getColId()
+        setTimeout(() => {
+          params.api.startEditingCell({ rowIndex: nextRowIndex, colKey: colId })
+        }, 30)
+        return {
+          rowIndex: nextRowIndex,
+          column: firstCol,
+          rowPinned: previousCell.rowPinned
+        }
+      }
+    }
+  }
+
+  return suggestedNextCell
+}
+
+defineExpose({ focusRow, gridApi })
 </script>
+
 <template>
-  <div class="ks-grid" :aria-busy="props.loading">
+  <div class="ks-grid" :style="{ height: props.height ?? '100%' }" :aria-busy="props.loading">
     <AgGridVue
-      style="height: 100%; width: 100%"
+      style="height: 100%; width: 100%; flex: 1; min-height: 0;"
       :theme="themeQuartz"
       :row-data="props.rows"
       :column-defs="columnDefs"
       :row-selection="rowSelectionOptions"
+      :row-class-rules="rowClassRules"
+      :enter-navigates-to-next-cell="true"
+      :enter-navigates-to-next-cell-after-edit="true"
+      :navigate-to-next-cell="navigateToNextCell"
+      :stop-editing-when-cells-lose-focus="true"
       :loading="props.loading"
       overlay-no-rows-template="<div class='ks-ag-empty-overlay'><span style='font-size:2rem;'>📭</span><p style='margin-top:8px;font-weight:600;color:var(--ks-color-neutral-700);'>조회된 데이터가 없습니다</p><p style='font-size:12px;color:var(--ks-color-neutral-500);'>검색 조건을 변경하거나 신규 데이터를 수집하세요.</p></div>"
       @grid-ready="onGridReady"
       @first-data-rendered="onGridReady"
       @sort-changed="onSortChanged"
       @row-clicked="onRowClicked"
+      @cell-value-changed="onCellValueChanged"
     />
   </div>
 </template>
 
+
+
+
 <style scoped>
-.ks-grid { flex: 1; height: 100%; width: 100%; min-height: 0; border: 1px solid var(--ks-color-neutral-200); border-radius: var(--ks-radius-md); overflow: hidden; background: #fff; }
+.ks-grid {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  width: 100%;
+  min-height: 0;
+
+  border: 1px solid var(--ks-color-neutral-200);
+  border-radius: var(--ks-radius-md);
+  overflow: hidden;
+  background: #fff;
+}
+
+:deep(.ag-row.ks-row-added) {
+  background-color: #f0fdf4 !important;
+  color: #15803d !important;
+  font-weight: 600;
+}
+
+:deep(.ag-row.ks-row-modified) {
+  background-color: #fffbeb !important;
+  color: #b45309 !important;
+  font-weight: 600;
+}
+
+:deep(.ag-cell-editable) {
+  background-color: #fafafa;
+  cursor: text;
+  transition: background-color 0.15s ease;
+}
+
+:deep(.ag-cell-editable:hover) {
+  background-color: #f0f9ff !important;
+}
+
+:deep(.ag-cell-inline-editing) {
+  background-color: #ffffff !important;
+  box-shadow: inset 0 0 0 2px var(--ks-color-action, #0284c7) !important;
+}
 </style>
+
+