Gusambanjeom is a small Chinese restaurant in Ido 2-dong, Jeju. Its signature dish is old-style cold udon with peanut sauce, and it also serves jjamppong and ganjjajang. The restaurant is run by a family, with the father, mother, son, and daughter-in-law dividing cooking and serving duties, and there are only four seats inside. The wait gets long during lunch hours.