In Myeongdong, go to Olive Young Myeongdong Town (53 Myeongdong-gil, 1F–2F) or Central Myeongdong Town (27 Myeongdong 8-gil, M Plaza, B1–3F), open until 10:30pm. Need just one sunscreen? The 50ml Water-fit sun serum has 11K reviews; at 50ml it goes in your 1L clear bag for the cabin. The set has several tubes, so leave one at work.