In Myeongdong, go to Olive Young Myeongdong Town (53 Myeongdong-gil, 1F-2F) or

Central Myeongdong Town (M Plaza, 27 Myeongdong 8-gil, B1-3F), open till 10:30 pm. The 딥 클린 올킬 remover has 4.3K+ reviews; its 200ml 1+1 set is over 100ml, so check it in. Carry-on liquids must be 100ml or less per bottle, in a 1L clear bag.