Jongno Son Kalguksu is a noodle shop in Seoul that serves janchi guksu, bibim guksu, and son kalguksu. In summer it offers kongguksu, cold creamy soybean broth with thick kalguksu noodles. The shop also serves sujebi, hand-torn dough soup. Kongguksu is a summer-only menu item, so whether it can be ordered depends on the season.