Oas is a large cafe in the Gogi-ri amusement park area of Suji-gu, Yongin. It brews coffee from beans it roasts itself and sells cold-pressed cleanser juices and baked goods made in-house. Ordering a drink lets you taste six kinds of cleanser juice on the second floor, and the third floor has an outdoor terrace. On weekend afternoons the parking lot can fill up.