diff --git a/bangdori/7.js b/bangdori/7.js
new file mode 100644
index 0000000..9dcf3b5
--- /dev/null
+++ b/bangdori/7.js
@@ -0,0 +1,15 @@
+const MAX = 2 ** 31 - 1;
+const MIN = -(2 ** 31);
+
+/**
+ * @param {number} x
+ * @return {number}
+ */
+var reverse = function (x) {
+  const reversed = x.toString().split("").reverse().join("");
+  const n = parseInt(reversed);
+
+  if (n > MAX || n < MIN) return 0;
+
+  return x < 0 ? -n : n;
+};