Hongdae and Itaewon are the two most popular areas with foreigners that like to party.
If you like to be catered to and see English menus, you’ll feel right at home. If you came to experience the Korean version of nightlife, get thee to Kondae (Konkuk University, line 2) or Sinchon (also line 2). While some foreigners also visit these areas, you’ll notice fewer English menus (a great chance to practice your Korean!)