Why a three-stop Korea trip makes return planning awkward
The classic first visit looks deceptively simple on a map: Seoul for food and neighborhoods, a fast train to Busan for beaches and seafood, then Jeju for volcanic landscapes. The problem is not getting between those places. It is deciding where the holiday ends.
You might arrive at Incheon, spend four nights in Seoul, ride the KTX to Busan and fly to Jeju. Once you are on Jeju, the most convenient way home may be to return through Seoul. But another traveler might add an extra week in Busan, while a third may head to Japan after Jeju. Buying an expensive fixed return on day one can lock you into a route you have not yet tested.
The Korea Tourism Organization describes the KTX network connecting Seoul and Busan, so you can plan that middle leg without confusing it with international departure evidence. The return question is separate: which flight takes you out of Korea, and on what date?