LGBTQI+ scene
The first thing to understand about Seoul is that there are two scenes and they barely meet.
Itaewon is the international one. That's where Homo Hill sits, a short pedestrian slope packed with small bars one after another, with a mixed crowd of young Koreans and foreigners; names like Ground, Kookie or Public come up, and for a bear crowd Gym, Michin or Dirty Heaven. It's the easy option if you don't speak Korean.
Jongno 3-ga is the Korean one, and it's the bigger one: in the old city's alleys locals reckon around seventy gay businesses, with more than twenty-five tiny bars —Shortbus, Friends and many with no sign— with regulars, little tourist turnover and almost no English. It takes more effort to get into, but it's the half of Seoul that outsiders rarely see.
And a practical detail: nights run very late. People go out after eleven and clubs don't empty until five or six. The metro closes around midnight, so budget for a taxi home — they're cheap.