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Xiao He Yun and Li Shi Qing get off the bus before it explodes to investigate the bus driver. They go to the police to give them clues and hopefully get more clues. However the police are suspicious of their intentions.

The police find out that Li Shi Qing and Xiao He Yun were investigating the bus driver. The police find out the motive for the explosion and the result is fast. They keep wondering about the source of information and their motive. Li Shi Qing asks the police officer how to stop a bomb on the bus. This time they get the police involved immediately, however the bus doesn't stop. 

We learn what happened five years ago. Zhang Cheng is seriously injured in the blast and dies. They think there is something else missing from the loop. 

Wang Xing De's wife makes him feel guilty about not answering his daughter's phone call. Wang Xing De gets hired to drive a bus and he wants to drive route 45. His wife creates a bomb. Li Shi Qing tries to find out what happened to Wang Xing De's daughter. They find a witness to the accident five years ago.

We finally learn the real reason Wang Xing De's daughter died. They even have a photo of the culprit. This time Li Shi Qing puts the plan in action because Xiao He Yun doesn't wake up. They end up stopping the bomb with zero casualties.