Make Jeonju more than a transfer
A one-night stop can work when arrival is early enough, but it should not be justified only by adding another city name. Protect the station transfer, keep the hanok area geographically grouped and leave space for a market or meal without scheduling every hour. If the total trip is too short, a simpler Seoul and Busan route is usually more resilient.
Do not assume the onward train
The useful Jeonju–Busan path depends on the date and available services. Search the complete live route and note any connection before choosing a hotel or timed activity. The builder labels this as intercity rail but deliberately does not promise a direct service, journey duration or fare that could be wrong for the selected day.
Compare one complete cost
Add the real per-person KORAIL fares that remain after the itinerary is fixed. Compare them with the official pass price for the same travellers and selected rail dates, then keep local transport separate. Book the winning rail setup, follow with cancellable stays, and delay optional experiences until the transfer days are secure.