In Myeongdong, try the two big stores: Olive Young Myeongdong Town (53

Myeongdong-gil, 1F–2F) and Central Myeongdong Town in M Plaza (27 Myeongdong 8-gil, B1–3F), both open till 10:30 PM. Dry skin? Find Torriden Dive-In Cleansing Foam (16K+ reviews). Many foams come single or as a 2-pack, so check before paying. Over 100ml goes in checked luggage.