How can I get from Seoul to Busan cheaper?
I know 2 ways, by train or by plane, then you need to check the prices and calculate.
The cheapest and simplest train is Mugunghwa. It takes longer than KTX, but it allows you to see people and Korea. Take a look. You can also fly, but that’s not always available; you need to catch promotions and travel at the least popular times.