Express and all-stop use the same destination differently
The official railway separates the reserved Express product from the all-stop service. Compare the current departure time, terminal, fare and luggage handling rather than assuming ‘Express’ always shortens the complete trip. Both still end with the route from Seoul Station to the accommodation.
Seoul Station is a large final transfer
Check which exit or connected building serves the hotel, lift availability and the street crossing. A hotel labelled near Seoul Station may be easy from one concourse and awkward from another. Count that segment before buying a train ticket.
Use a live ticket only after the route wins
Airport operating windows and ticket conditions can change. Use the transfer finder with the post-immigration time, luggage and group size; when rail wins, open the authorised live AREX offer from the result rather than treating a static article as inventory.