Olive Young N Seongsu is at 13 Yeonmujang 7-gil (Factorial Seongsu), open till 10 PM. Daiso Seongsu 2-ga is at 106 Seongdeokjeong-gil, so both are walkable. ROUND LAB 1025 Dokdo Peeling Gel (1,973 reviews) is gentle like its Dokdo cleanser line. Gels over 100ml go in checked luggage.