Old Son Jjajang is a Chinese restaurant near Cheonho-dong and Myeongil-dong in Seoul that serves jjajangmyeon, jjamppong, and tangsuyuk. It offers ganjjajang and samseon jjamppong, and the ganjjajang comes in a saucy yuni-jjajang style. After a renewal opening in early April 2019, the interior became spacious and comfortable, and there is a wait during weekend meal times. The tangsuyuk is small in portion and heavy with flour, making it greasy.