Hi there, will be travelling from Seoul to Busan on the 13th Sept - 15th & it happen to be a P.Holiday. I've make the reservation for the Korail Pass but i realise all KTX seats have been fully booked. So i can only opt for the standing tickets provided it's still available. So may i ask what if even standing tickets also no available, will i be prevent from boarding the train? Please help thanks x 2