Supermalcha Seongsu is a cafe in Seongsu, Seoul, selling matcha lattes, smoothies, refreshers, ice cream, and cake. It also serves drinks made with oat milk, such as oat latte and strawberry matcha latte. To stay in the store, every person in the group must order a drink, so a single order does not allow you to take a seat. The matcha flavor is weak, and the oat cream or milk flavor is more prominent.