One day, Kwang Soo, who followed his late mother’s footsteps, promises to travel with his friend Seung Hwan. However, he finds an application for Tae Jong’s father’s admission to an AIDS clinic, and his father orders him to visit his mother’s grave together for the last time. Kwang Soo breaks his promise with Seung Hwan and follows his father. Kwang Soo, who was shouting in front of the oxygen, sees his mother’sfantasy and feels that he was not a vocalist but an onlooker. Realizing that he was in love with a Buddhist monk, Kwang Soo leaves his sick father behind him and goes to Seung Hwan late into the night and tells him to go on a ‘tomorrow’ train trip.