In Gwangalli, try the Gwangan Beach Store (235 Gwanganhaebyeon-ro, #101) or Gwangalli Store (153-1 Gwanganhaebyeon-ro), both 11:00-23:00; for mornings, Millac The Market opens at 10:00. There's no Daiso within 1km of Gwangalli, so shop Daiso in Seomyeon first. Stock per store wasn't checked. The 150ml pack cleanser goes in checked luggage.