Kushibeom is an izakaya at the entrance of Seongsu Yeonbang in the Seongsu cafe street, serving Japanese-style skewers and fried dishes. It offers chicken skin fries and a cinnamon highball. On weekend evenings the wait runs close to an hour, and you write your phone number by hand to hold a spot instead of using an app. Other menu items and flavors are ordinary, so there is little that stands out enough to bring you back.