Mentoz Study Cafe Busan Gupo is a study cafe in Gupo 3-dong, Busan. It has snacks and drinks on hand, and staff respond right away when a noisy user is reported through a KakaoTalk message sent via the app. The gap between the pantry and the study room does not fully block the sound of the coffee maker and the ice machine. Lighting is on the dim side, and there are only about five stand lamps.