Taeseonggak is a 24-hour Chinese restaurant in Seoul that serves jjajangmyeon, jjamppong, and tangsuyuk. The jjamppong contains a lot of mussels and squid, and the broth is light but quietly spicy. Meals are available in the early morning hours, and payment can be made in cash or by bank transfer. Paying by card is charged at the base price with no hall discount.