In Gangnam, go to Olive Young Central Gangnam Town (403 Gangnam-daero, B1–4F) or Gangnam Town (429 Gangnam-daero, 1F–3F), near Gangnam Station on Line 2, open until 10:30pm. The Collagen Peptide jelly serum mist, 50ml plus 10ml, has 3,200 reviews and is easy to spritz before makeup. Pair it with the underground shops.