In Myeongdong, Olive Young Myeongdong Town (53 Myeongdong-gil, 1F–2F) is open

until 10:30pm, and Daiso Myeongdong Main Store (43 Myeongdong-gil) until 10pm. They're on the same street, so hit Daiso first. Daiso's 엔트로피 comes as 03검정 (black) and 02픽서 (fixer), ₩5,000 each.