Opu is a cafe on the third floor of a building set back from the main streets of Seongsu in Seoul, serving coffee and desserts with unusual visuals. Its signature items include desserts such as O!Bed and O!Sofa, bam latte, and Opu latte with a strong truffle aroma. Customers check the menu by QR code at their seat and order at the counter. The truffle-forward Opu latte does not pair well with the desserts.