Jeju Geumseongmun is a Chinese restaurant in Jeju that serves jjajangmyeon, jjamppong, and tangsuyuk. The tangsuyuk comes in a large portion, and its glutinous rice batter is chewy rather than crisp. The ganjjajang is edible, but the noodles and sauce feel disconnected. The jjamppong broth is bland and has neither wok fire flavor nor spiciness.