Flup Coffee is a cafe in Yeonsinnae that serves coffee, ades, and desserts such as cake and mille-feuille. When you order mille-feuille, cake, or one of the several ades, the coffee is brought to your table. The interior is dark navy and there is a rooftop, and the mille-feuille cream is not very sweet. The space is smaller than it appears in photos.