In Myeongdong, Daiso Myeongdong main store (43 Myeongdong-gil) and Olive Young

Myeongdong Town (53 Myeongdong-gil, 1F-2F) are a minute apart. Olive Young's Aer KF94 Peak V Light is wrapped one by one, with 493 reviews, so it's easy to keep a spare in your bag.