diff --git a/src/util/canvas-util.js b/src/util/canvas-util.js
index 9420e910..3e3f4059 100644
--- a/src/util/canvas-util.js
+++ b/src/util/canvas-util.js
@@ -535,9 +535,21 @@ export function isPointOnLine({ x1, y1, x2, y2 }, { x, y }, epsilon = 2) {
   const crossProduct = (y - y1) * (x2 - x1) - (x - x1) * (y2 - y1)
   if (Math.abs(crossProduct) > 1000) return false // 작은 오차 허용
 
+  const isSameX = Math.abs(x1 - x2) < 2
+  const isSameY = Math.abs(y1 - y2) < 2
+
   // 점이 선분의 범위 내에 있는지 확인
-  const withinXRange = Math.min(x1, x2) - x <= 2 && 2 <= Math.max(x1, x2) - x
-  const withinYRange = Math.min(y1, y2) - y <= 2 && 2 <= Math.max(y1, y2) - y
+  let withinXRange = Math.min(x1, x2) - x <= 2
+  if (!isSameX) {
+    withinXRange = withinXRange && 2 <= Math.max(x1, x2) - x
+  }
+
+  let withinYRange = Math.min(y1, y2) - y <= 2
+  if (!isSameY) {
+    withinYRange = withinYRange && 2 <= Math.max(y1, y2) - y
+  }
+
+  console.log(Math.min(x1, x2) - x, Math.max(x1, x2) - x)
 
   return withinXRange && withinYRange
 }