Isu Jjajang is a small neighborhood Chinese restaurant near Namseong Market in Seoul that serves jjajangmyeon, jjamppong, and tangsuyuk. The jjajangmyeon is not overly seasoned, and the ganjjajang and samseon jjajang come in large portions. The restaurant takes only dine-in customers and does not deliver, and customers who order a cooked dish can choose a mini jjajang or jjamppong. The jjamppong is more ordinary than the jjajang.