diff --git "a/leetcode3/\355\231\251\354\235\200\354\247\200/66. Plus One.js" "b/leetcode3/\355\231\251\354\235\200\354\247\200/66. Plus One.js"
new file mode 100644
index 00000000..24c97c91
--- /dev/null
+++ "b/leetcode3/\355\231\251\354\235\200\354\247\200/66. Plus One.js"	
@@ -0,0 +1,17 @@
+/**
+ * @param {number[]} digits
+ * @return {number[]}
+ */
+var plusOne = function (digits) {
+  for (let i = digits.length - 1; i >= 0; i--) {
+    if (digits[i] < 9) {
+      digits[i]++;
+      return digits; // 1을 더했으므로 즉시 배열 반환
+    }
+
+    digits[i] = 0;
+  }
+
+  digits.unshift(1);
+  return digits;
+};