In Hongdae, go to Olive Young Hongdae Town (57 Hongik-ro 6-gil) or Hongik Univ.

Station (156 Yanghwa-ro), both open until 11pm, so you can go after shopping. The Balanceful tinted lip essence, 11ml, has a Sanrio edition in 5 shades (1,000 reviews), cute as a gift. Hongdae stays busy at night, so late hours help.