Gu Yu, the son of a well-known local construction group in W City, is missing! The police originally thought it was another bloody story about a rich kid running away from home, until they recovered Gu Yu's body from the Blackwater River. Gu Yu looked like he accidentally drowned, but the wound on the back of his head indicated that everything was not as simple as it seemed. As the investigation deepens, the truth is revealed step by step by police officer Lao Zhang: the legend of the Blackwater River, his high school girlfriend Lin Xi, and the wealthy daughter Lin Wan who is far away in City A... As Lao Zhang interrogates Gu Yu's high school girlfriend Lin Xi step by step, her lies are gradually exposed, and one story after another emerges, and the truth seems to be close at hand.
The police always feel that the person being interrogated has something to hide, and they are more willing to believe the truth they discover with their own hands. However, is what they discover with their own hands necessarily the truth?
