Dongdaemun (동대문; 東大門) literally means Great East Gate. The Great East Gate was a major city gate during the Joseon Dynasty.
If you love shopping, you won’t be disappointed with Dongdaemun Fashion District/Dongdaemun Market (동대문시장). Guess what, most shopping malls here operate from 10am all the way till 5am! These shopping malls include the newly open Doota (두타), hello aPM (헬로에이피엠) which might be inspired by the two boybands 2AM and 2PM (or probably the other way round) and Migliore (밀리오레). You can get pretty good locally design apparels.
With good and affordable apparels, you can even bargain and you may even get T-shirts for as low as 10,000 Won!
To get there, alight either at Dongdaemun Station (동대문역) or Dongdaemun History and Culture Park Station (동대문역사문화공원역).