Seongsu Udon is a snack shop near E-Mart in Seongsu-dong that serves udon, gimbap, noodles, and rice bowls. Its menu includes anchovy-broth udon, jeyuk deopbap, and bibim noodles, and the udon noodles are chewy. On weekday lunchtimes the hall fills with office workers, and there are tables where a single person can sit. From ordering to carrying food and returning dishes, customers do everything themselves.