Strawberry32 Seongsu is a cake shop in Seongsu, Seoul, selling mango and strawberry cakes and mango bingsu. The mango cake contains mango and passion fruit layered with fresh cream and sponge. Cakes are reserved at least one week in advance through Naver or KakaoTalk, then picked up at the desired time on the day. The shop is not visible from outside, so look for the strawberry box in the second-floor window.