diff --git a/bangdori/139.js b/bangdori/139.js
new file mode 100644
index 0000000..4c5d34e
--- /dev/null
+++ b/bangdori/139.js
@@ -0,0 +1,27 @@
+/**
+ * @param {string} s
+ * @param {string[]} wordDict
+ * @return {boolean}
+ */
+var wordBreak = function (s, wordDict) {
+  const n = s.length;
+  const wordSet = new Set(wordDict);
+
+  let maxLength = 0;
+  for (const word of wordSet) {
+    maxLength = Math.max(maxLength, word.length);
+  }
+
+  const dp = Array(n + 1).fill(false);
+  dp[0] = true;
+
+  for (let i = 1; i <= n; i++) {
+    for (let j = i - 1; j >= Math.max(i - maxLength, 0); j--) {
+      if (dp[j] && wordSet.has(s.substring(j, i))) {
+        dp[i] = true;
+      }
+    }
+  }
+
+  return dp[n];
+};