Twosome Place Seongsu SK V1 Tower is a cake and coffee cafe on the first floor of the SK V1 building in Seongsu, a three-minute walk from Exit 3 of Seongsu Station. It serves cakes such as schoseng, peachseng, and mangoseng, eaten with coffee. Long tables have power outlets, so you can work on a laptop. The store is clean and comfortable, with comfortable seating.