Coffee Exchange is a roastery cafe in Seoul, between Wangsimni Station and Majang Station and within a five-minute walk of Majang Station. Customers choose beans roasted on site by number according to acidity and sweetness, and can eat bakery items such as sandwiches and scones. The cafe occupies a converted warehouse with high ceilings and wide spacing between tables, and it is not crowded before lunch on weekends. It sits among apartment complexes, so reaching it without a car is inconvenient.