A mysterious train was discovered in the Island of Jeju. There, scientists discovered the train to be somewhat a mechanical time machine. Many years upon researching, Ju Haknyeon was being sent to individualy work the train and ride to where the destination will bring him. He's the only one who can ride the train for his mental health is more stable than the rest of the people from Jeju. Ju Haknyeon don't mind what will happen to him in the experiment. Besides, he's not fully aware about what they will face. But what will face him after the stop of the train? Will he really be survive? Will he know the secrets? Should he trust everyone on that Island? What will happen to him?