diff --git a/src/hooks/roofcover/useAuxiliaryDrawing.js b/src/hooks/roofcover/useAuxiliaryDrawing.js
index 4997bdf8..7cacdd03 100644
--- a/src/hooks/roofcover/useAuxiliaryDrawing.js
+++ b/src/hooks/roofcover/useAuxiliaryDrawing.js
@@ -24,7 +24,7 @@ import { calculateAngle, isSamePoint } from '@/util/qpolygon-utils'
 import { POLYGON_TYPE } from '@/common/common'
 
 // 보조선 작성
-export function useAuxiliaryDrawing(id) {
+export function useAuxiliaryDrawing(id, isUseEffect = true) {
   const canvas = useRecoilValue(canvasState)
   const { addCanvasMouseEventListener, addDocumentEventListener, removeMouseLine, initEvent } = useEvent()
   // const { addCanvasMouseEventListener, addDocumentEventListener, removeMouseLine, initEvent } = useContext(EventContext)
@@ -654,6 +654,8 @@ export function useAuxiliaryDrawing(id) {
             selectable: true,
             name: 'auxiliaryLine',
             isFixed: true,
+            attributes: { ...line1.attributes },
+            parentId: line1.parentId,
           },
         )
         lineHistory.current.push(newLine)
@@ -674,6 +676,8 @@ export function useAuxiliaryDrawing(id) {
               selectable: false,
               name: 'auxiliaryLine',
               isFixed: true,
+              attributes: { ...line1.attributes },
+              parentId: line1.parentId,
             })
             lineHistory.current.push(newLine)
             lineHistory.current = lineHistory.current.filter((history) => history !== line1)
@@ -685,6 +689,8 @@ export function useAuxiliaryDrawing(id) {
               selectable: false,
               name: 'auxiliaryLine',
               isFixed: true,
+              attributes: { ...line1.attributes },
+              parentId: line1.parentId,
             })
             lineHistory.current.push(newLine)
             lineHistory.current = lineHistory.current.filter((history) => history !== line1)
@@ -724,6 +730,8 @@ export function useAuxiliaryDrawing(id) {
             selectable: true,
             name: 'auxiliaryLine',
             isFixed: true,
+            attributes: { ...line1.attributes },
+            parentId: line1.parentId,
             intersectionPoint,
           })
         } else {
@@ -733,6 +741,8 @@ export function useAuxiliaryDrawing(id) {
             selectable: true,
             name: 'auxiliaryLine',
             isFixed: true,
+            attributes: { ...line1.attributes },
+            parentId: line1.parentId,
             intersectionPoint,
           })
         }
@@ -825,7 +835,7 @@ export function useAuxiliaryDrawing(id) {
 
     //lineHistory.current에 있는 선들 중 startPoint와 endPoint가 겹치는 line은 제거
     // 겹치는 선 하나는 canvas에서 제거한다.
-    const tempLines = [...lineHistory.current]
+    const tempLines = canvas.getObjects().filter((obj) => obj.name === 'auxiliaryLine' && !obj.isAuxiliaryFixed)
     lineHistory.current = []
     tempLines.forEach((line) => {
       if (
@@ -842,7 +852,7 @@ export function useAuxiliaryDrawing(id) {
       lineHistory.current.push(line)
     })
 
-    const innerLines = lineHistory.current
+    const innerLines = lineHistory.current.filter((line) => line.name === 'auxiliaryLine' && line.visible)
 
     roofBases.forEach((roofBase) => {
       const tempPolygonPoints = [...roofBase.points].map((obj) => {
@@ -865,6 +875,7 @@ export function useAuxiliaryDrawing(id) {
             actualSize: line.attributes?.actualSize ?? 0,
             planeSize: line.getLength(),
           }
+          line.isAuxiliaryFixed = true
           return true
         }
       })
diff --git a/src/hooks/useContextMenu.js b/src/hooks/useContextMenu.js
index 38cdedc1..184a3aea 100644
--- a/src/hooks/useContextMenu.js
+++ b/src/hooks/useContextMenu.js
@@ -180,6 +180,12 @@ export function useContextMenu() {
               fn: () => {
                 if (!currentObject) return
                 const roof = canvas.getObjects().filter((obj) => obj.id === currentObject.attributes.roofId)[0]
+                if (!roof) {
+                  // 아직 innerLines로 세팅이 안되어있는 line인 경우 제거
+                  canvas.remove(currentObject)
+                  canvas.discardActiveObject()
+                  return
+                }
                 const innerLines = roof.innerLines?.filter((line) => currentObject.id !== line.id)
                 roof.innerLines = [...innerLines]
                 canvas.remove(currentObject)
@@ -221,6 +227,11 @@ export function useContextMenu() {
                   name: 'auxiliaryLine',
                   attributes: { ...currentObject.attributes },
                 })
+
+                if (!currentObject.attributes.roofId) {
+                  return
+                }
+
                 canvas
                   .getObjects()
                   .filter((obj) => obj.id === currentObject.attributes.roofId)[0]
@@ -235,11 +246,21 @@ export function useContextMenu() {
                   swalFire({ text: '지붕을 선택해주세요.' })
                   return
                 }
-                const innerLines = canvas.getObjects().filter((obj) => obj.id === currentObject.attributes.roofId)[0].innerLines
-                innerLines.forEach((line) => {
+                const innerLines = canvas.getObjects().filter((obj) => obj.id === currentObject.attributes.roofId)[0]?.innerLines
+                if (innerLines) {
+                  innerLines.forEach((line) => {
+                    canvas.remove(line)
+                  })
+                  innerLines.length = 0
+                }
+
+                // 확정되지 않은 보조선
+                const notFixedAuxiliaryLines = canvas.getObjects().filter((obj) => obj.name === 'auxiliaryLine' && !obj.isAuxiliaryFixed)
+
+                notFixedAuxiliaryLines.forEach((line) => {
                   canvas.remove(line)
                 })
-                innerLines.length = 0
+
                 canvas.renderAll()
               },
             },
diff --git a/src/store/localeAtom.js b/src/store/localeAtom.js
index 0f20fa87..0564e633 100644
--- a/src/store/localeAtom.js
+++ b/src/store/localeAtom.js
@@ -2,7 +2,7 @@ import { atom } from 'recoil'
 
 export const globalLocaleStore = atom({
   key: 'globalLocaleState',
-  default: 'ko',
+  default: 'ja',
 })
 
 export const appMessageStore = atom({