After an opponent dies mid-match, a prominent MMA champion swore never to fight again and retired to run his family's company. But when his best friend dies under suspicious circumstances, he has no choice but to step back in the ring.

Sheriff Zhan Yu encountered a man who died suddenly before traveling with her colleagues in the crew. The man stole something on police officer Cai Yin before dying. Zhan Yu and others continued to board the car after handing over with colleagues. What they didn't expect was that the ensuing series of abnormal conditions endangered the safety of the entire train.

Qin Yue is embarrassed of her mother's new job as a municipal cleaner. When she is teased by a more well-off classmate, she claims her mother is working as a flight attendant.