Manghyang Bibim Guksu Changdong is a noodle shop in Changdong, Seoul, that serves bibim guksu, mandu, and donkatsu. The bibim guksu uses jungmyeon noodles with crisp onion and a sweet-and-sour sauce, eaten with hot chaeksu broth. After sitting down, you check your seat number and order and pay in advance, and the food comes out in five minutes. The taste and quality of the mandu are a drawback.