TBD is a wine bar in Seongsu that serves sandwiches and coffee during the day and natural wine with European-style snacks in the evening. The menu includes eggplant sandwiches, burrata cheese, and a pineapple dessert, and the bar carries only natural wine. Daytime hours run from noon to 3 p.m., evening hours start at 6 p.m., and reservations are made through Instagram DM. With few furniture pieces to absorb sound, conversation from the next table comes through as ringing noise.