diff --git a/src/hooks/usePolygon.js b/src/hooks/usePolygon.js
index 1bc2dffa..e1f127a5 100644
--- a/src/hooks/usePolygon.js
+++ b/src/hooks/usePolygon.js
@@ -859,6 +859,7 @@ export const usePolygon = () => {
       line.endPoint = endPoint
     })
 
+    // polygon line에서 각각 출발한다.
     polygonLines.forEach((line) => {
       /*line.set({ strokeWidth: 5, stroke: 'green' })
       canvas.add(line)
@@ -872,9 +873,11 @@ export const usePolygon = () => {
       const startLine = line
       const visitPoints = [startPoint]
       const visitLines = [startLine]
+      let notVisitedLines = []
       let cnt = 0
 
       while (!isSamePoint(currentPoint, arrivalPoint)) {
+        //현재 점으로 부터 갈 수 있는 다른 라인을 찾는다.
         let nextLines = allLines.filter(
           (line2) =>
             (isSamePoint(line2.startPoint, currentPoint) || isSamePoint(line2.endPoint, currentPoint)) &&
@@ -892,8 +895,13 @@ export const usePolygon = () => {
           )
         }
 
-        if (!nextLines) {
-          break
+        if (nextLines.length === 0) {
+          //아직 안갔던 line중 0번째를 선택한다.
+          if (notVisitedLines.length === 0) {
+            break
+          } else {
+            // nextLines = [...notVisitedLines.shift().line]
+          }
         }
 
         let comparisonPoints = []
@@ -919,6 +927,14 @@ export const usePolygon = () => {
         nextLines.forEach((nextLine) => {
           if (isSamePoint(nextLine.startPoint, minDistancePoint) || isSamePoint(nextLine.endPoint, minDistancePoint)) {
             visitLines.push(nextLine)
+          } else {
+            notVisitedLines.push({
+              line: nextLine,
+              endPoint: nextLine.endPoint,
+              startPoint: nextLine.startPoint,
+              currentPoint: { ...currentPoint },
+              roofPoints: [...roofPoints],
+            })
           }
         })