Well, the train is fast and slow. The fast one is called KTX, and the slow one is called endless flowers. In fact, there is not much difference, because the place is small and magnificent. I have traveled from Busan to Seoul, with more than 20,000 people. ktx is twice as expensive and the bus price is different. The difference between the expressway and the bus outside the city is 1 1,000 yuan. I really don't know how much it costs. By train, it is at Seoul Railway Station, the express bus is at Seoul Express Bus Station, and the out-of-town bus is at Seoul South Bus Station. You can also call 1330 for consultation. It's a tourist consultation telephone for foreigners, with Chinese service. By the way, train tickets are not necessarily available, especially ktx. You should book it in advance.