Hahahaseongsu is a cafe on the road from Seongsu to Seoul Forest in Seoul, selling pudding cakes, coffee, milk tea, and champagne. It serves banana, blueberry, and apple cinnamon pudding cakes along with its signature Hutchu coffee, and champagne is available during the day. The store is large, and before 4 p.m. the daytime champagne is offered at a 40% discount. A mascot dog named Bo is in the store.