Detective Shi Anni

At thirty, Shi Anni has no house or car and is, in short, unemployed. But he is the kind of man who can't help sticking his nose into other people's business.

On his way home one day, he comes across a car that has crashed into a guardrail. An unfamiliar woman is dead in the driver's seat. After Shi Anni calls the police, he turns around, only to find that the woman's body has vanished.

When the police get involved, they initially suspect Shi Anni staged the whole thing and is hiding the killer's identity. Meanwhile, a second murder takes place elsewhere. This rules Shi Anni out as a suspect and shows that the new case is unrelated to the earlier crash.

Shi Anni is inexplicably cleared of suspicion. Feeling wronged, he decides to investigate the string of murders unfolding around him.