In Seongsu, try Daiso Hanssem Mart Seongsu (118 Seongsui-ro, 6am–11pm) or

Seongsu 2-ga (106 Seongdeokjeong-gil, 10am–10pm). The elephant has 5,103 orders. After Seongsu's cafés, walk to Seoul Forest and take photos with your balloon. Hanssem Mart opens at 6am, handy before an early Seoul Forest walk.