In Hongdae: Olive Young Hongdae Town (57 Hongik-ro 6-gil) and Hongik Univ.

Station Store (156 Yanghwa-ro, 1F), 10am–11pm, so you can shop after a night out. Soul Vegan Lip Balm (3.9g) comes in 4 types with 2,456 reviews. Tints and balms are tiny, fine for carry-on. If the Town store is packed, the station store is right by the exit.