Lin Ye, who was hunted by the Space-Time Management Bureau, accidentally broke into an alien space at the critical moment of life and death, and boarded a mysterious train that traveled through countless eras. There are both an old man looking for a girl in 1943 and an astronaut stationed on Mars in 2077. Every passenger is looking for their own answer, but no one knows the destination of the train.
The countdown on his wrist keeps devouring his existence time, and there is a fatal secret behind the steward's vague "I don't know" - when the time reaches zero, will you find all the truth, or will you become an eternal "part" of the train? From tracing the truth behind the death of his parents to fighting against the pursuit of the Space-Time Administration, Lin Ye is competing with fate and the risk of disappearance in every carriage of the train. In this journey through time and space with no return, every answer is revealed with a heavier price, and the true purpose of the train is far more terrifying than imagined.
