Rough Rough Seongsu is a cafe on the fourth floor in Seongsu, Seoul, selling several kinds of cheesecake and coffee. The lineup centers on Basque cheesecake, with an apple cinnamon flavor and matcha latte also available. The space is large, with sofa seating and chairs that have backrests. Because it is on the fourth floor, you have to take the stairs, as there is no elevator.