Near Gangnam Station there's Daiso Gangnam Station 2nd store (109 Teheran-ro) and Gangnam Station store (422 Gangnam-daero), both 10 AM–10 PM. Tired of refills? The ₩1,000 washable pocket roller (2,208 orders) rinses clean with water, then dries for reuse.
Daiso Mall
Daiso MallDaiso Mall