Daiso's Myeongdong Main Store (43 Myeongdong-gil) and Myeongdong Station Store

(134-1 Toegye-ro) open 10:00-22:00, close to the Olive Young stores, so you can do both. For liner, the Super Slim Proof Pen Liner in 02 Brown is ₩3,000 with 5,268 orders. 슈퍼슬림 = super-thin tip and 프루프 = smudge-proof, nice for lower lash lines too.