In Myeongdong, go to Daiso Myeongdong Main (43 Myeongdong-gil) or Myeongdong

Station (134-1 Toegye-ro), both 10am–10pm. Bigger stores carry more skincare. VT Super Hyalon sleeping mask, 4ml × 6, is ₩3,000 with 38K orders. Small pouches are easy to travel with: apply at night and sleep.