I just took Set from Busan back to Seoul and would like to share as another options for tourists!

People usually get kxt when going to Busan and other cities. 

But I found the last train coming back to Seoul is around 10pm, which is too early for me since my concert ended around 9:30. Thanks to Srt, the last train was 11:00 so I made it back to Seoul around 1:17.

A faster and better option for me than bus!