Today's Chuseok KTX train ticket reservation

Hello. I tried to reserve Chuseok train tickets; there were 47,000 people in the queue, and it took me an hour to complete the reservation. In the end, almost all the southbound trains were sold out, so I just picked any available time, but I managed to get the time slot I wanted for the return trip. Last year, with 47,000 people in line, it was easy to get tickets, but this year was very difficult. Are the trains departing from Suseo to the Gyeongbu line two days ago and the ones departing from Seoul to the Gyeongbu line today completely different?