diff --git a/src/hooks/roofcover/useAuxiliaryDrawing.js b/src/hooks/roofcover/useAuxiliaryDrawing.js
index 72b094c9..46311ad9 100644
--- a/src/hooks/roofcover/useAuxiliaryDrawing.js
+++ b/src/hooks/roofcover/useAuxiliaryDrawing.js
@@ -616,6 +616,37 @@ export function useAuxiliaryDrawing(id) {
         removeLine(line1)
         intersectionPoints.current.push(...interSectionPointsWithRoofLines)
         return
+      } else if (interSectionPointsWithRoofLines.length === 1) {
+        //지붕선과 만나는 점이 하나일 경우
+        const distance1 = distanceBetweenPoints({ x: line1.x1, y: line1.y1 }, interSectionPointsWithRoofLines[0])
+        const distance2 = distanceBetweenPoints({ x: line1.x2, y: line1.y2 }, interSectionPointsWithRoofLines[0])
+
+        if (!(distance1 === 0 || distance2 === 0)) {
+          if (distance1 >= distance2) {
+            const newLine = addLine([line1.x1, line1.y1, interSectionPointsWithRoofLines[0].x, interSectionPointsWithRoofLines[0].y], {
+              stroke: 'black',
+              strokeWidth: 1,
+              selectable: false,
+              name: 'auxiliaryLine',
+              isFixed: true,
+            })
+            lineHistory.current.push(newLine)
+            lineHistory.current = lineHistory.current.filter((history) => history !== line1)
+            removeLine(line1)
+          } else {
+            const newLine = addLine([line1.x2, line1.y2, interSectionPointsWithRoofLines[0].x, interSectionPointsWithRoofLines[0].y], {
+              stroke: 'black',
+              strokeWidth: 1,
+              selectable: false,
+              name: 'auxiliaryLine',
+              isFixed: true,
+            })
+            lineHistory.current.push(newLine)
+            lineHistory.current = lineHistory.current.filter((history) => history !== line1)
+            removeLine(line1)
+          }
+          intersectionPoints.current.push(interSectionPointsWithRoofLines[0])
+        }
       }
 
       //보조선과 만나는 점을 찾는다.
diff --git a/src/util/qpolygon-utils.js b/src/util/qpolygon-utils.js
index a574c393..1e82aefb 100644
--- a/src/util/qpolygon-utils.js
+++ b/src/util/qpolygon-utils.js
@@ -1461,7 +1461,6 @@ export const drawRidgeRoof = (roofId, canvas) => {
  * @param canvas
  */
 const drawRidge = (roof, canvas) => {
-  debugger
   const wallLines = canvas?.getObjects().find((object) => object.name === POLYGON_TYPE.WALL && object.attributes.roofId === roof.id).lines // 외벽의 라인
   const roofLines = roof.lines // 지붕의 라인
   let ridgeRoof = []