If it's your first night out in Seoul and you don't know where to go, start with Itaewon. If you're in your early 20s and want young, high-energy nightlife and lots of clubs, choose Hongdae. For a more upscale night out, look toward Gangnam or Apgujeong. And if you'd rather experience Korean drinking culture, hidden bars and old-school streets than spend the night in a club, go to Euljiro. That's the short answer.