Myeongdong has many Olive Youngs; try Central Myeongdong Town (27 Myeongdong 8-gil, B1–3F) or Myeongdong store (14 Myeongdong 8-gil), both 10am–10:30pm. AESTURA's Atobarrier 365 cleansing milk (200ml) comes with a 30g foam. Over 100ml, so pack it in checked luggage.