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Shi-qing finds herself reliving the same bus crash where she is the only survivor, and despite her attempts, can’t save any other passengers but one.

Realizing only they are aware of the time loop, Shi-qing and He-yun team up to discover the truth and prevent the bus crash from happening.

Shi-qing tries to earn the police's trust by sharing some secret knowledge, but the bus crash appears to be more than a simple accident.

Shi-qing and He-yun try to find out the identity of the secret bomber, but get into an argument over a moral dilemma.

After failing to confront a suspicious passenger, Shi-qing and He-yun hatch a new plan. To their surprise, the suspect approaches them first.

Di learns about the time loop and offers to help the duo, who begin looking into the backgrounds of the victims on Bus 45.

Di's diary provides leads for the police. As Guo-qiang proves his innocence, Shi-qing decides to fulfill his last wish.

The bomber's identity comes to light. In a desperate attempt to stop the explosion, He-yun takes matters into his own hands.

Police learn about a key incident prior to the explosion. Now on the run together, He-yun learns of disappointing news while Shi-qing goes undercover.

Shi-qing and He-yun continue their efforts in saving everyone before the explosion to no avail. They learn that there may be more than one culprit.