3F is a hand-drip coffee cafe on the third floor of a residential building near Sin Yongsan Station in Yongsan-gu, Seoul. Drip coffee comes with a choice of beans, and the ssuk tiramisu is closer to a ssuk cake in taste. The seating is limited, so the room was full even at 1 p.m. and a line to wait outside sometimes forms. When three people go together, one of them sits in a chair without a backrest.