In Seongsu, Daiso Seongsu 2-ga (106 Seongdeokjeong-gil) and Ttukseom Station

store (6 Achasan-ro) are within 1km of Seongsu Station (Seongsu 2-ga is about 800m). Both open until 10 pm. Mini metal clips (4 pcs) are ₩1,000 with 300+ reviews, handy for pinning bangs during touch-ups.