Wonjo Hongdukkae Son Kalguksu is a restaurant in Seoul that serves kalguksu and sujebi. You can choose between kalguksu, sujebi, and kaljebi, and the kalguksu comes with clams and potato, served with geotjeori kimchi and a gochu ganjang seasoning. At lunchtime the line is long, and you can ask for a smaller portion when ordering. The sujebi is on the chewy and firm side.