Protagonist Cheng Mu is trapped in the K227 train death loop, repeatedly experiencing derailments and falls! With only a dozen or so life-extension chances left, he unlocks scanning and physical enhancement skills, deducing step by step to break the deadlock. He sees through the man in black's evidence-destruction conspiracy, rallies passengers on the train, exposes the dark inside story, dismantles the fatal device, breaks the unsolvable loop, and defies heaven to save the lives of everyone on the train!