diff --git a/code_study/Baekjoon/ts/2623.ts b/code_study/Baekjoon/ts/2623.ts
new file mode 100644
index 0000000..d811832
--- /dev/null
+++ b/code_study/Baekjoon/ts/2623.ts
@@ -0,0 +1,34 @@
+export {};
+
+const input = require("fs").readFileSync(0).toString().trim().split('\n');
+const [N, M]: number[] = input[0].split(" ").map(Number);
+
+let graph: number[][] = Array.from({length: N+1}, () => []);
+let inDegree: number[] = new Array(N+1).fill(0);
+for(let i=1; i<=M; i++) {
+    const line: number[] = input[i].split(" ").map(Number);
+    
+    for(let j=1; j<line[0]; j++) {
+        const [u, v]: number[] = [line[j], line[j+1]];
+        graph[u].push(v);
+        inDegree[v]++;
+    }
+}
+
+let qu: number[] = [];
+let idx: number = 0;
+for(let n=1; n<=N; n++) {
+    if (inDegree[n] === 0) qu.push(n);
+}
+
+while (idx < qu.length) {
+    const current: number = qu[idx++];
+
+    for(let next of graph[current]) {
+        inDegree[next]--;
+        if(inDegree[next] === 0) qu.push(next);
+    }
+}
+
+if (qu.length < N) console.log(0);
+else console.log(qu.join("\n"));
\ No newline at end of file