THE TWO-HOUR RULETime the rail leg, not the fantasy day
A destination qualifies only when a live direct or sensible rail result fits under two hours from its actual Seoul-area departure station. Hotel-to-attraction time will be longer.
Search date · train · stationLAST MILEThe station can be the hardest part
Daejeon has the easiest urban network. Gongju and Danyang can spend more of the saved rail time on local transfer, so compare the complete arrival chain.
Gateway is not attractionONE CITYDo not collect provinces in one day
Daejeon plus Gongju or Jecheon plus Danyang looks close on a national map. It creates two arrival problems and removes the useful middle of both days.
One return ticket · one corridorCHOOSE BY CONDITIONSWeather and closures pick the winner
Daejeon handles rain well, Gongju rewards a clear heritage walk, Asan favors a slow reset, Jecheon a level pace and Danyang stable outdoor weather.
Decision support, not ranking