The character is based on a real-life police hero.

A true story about a case that occurred in a city in Guizhou. During the handling of the case, the criminal investigation brigade resulted in the accidental death of the suspect, and all those involved in the case were sentenced to jail.After being released from prison, the personnel involved in handling the case insisted on tracking the fugitive suspects as ordinary people for the sake of justice in their hearts and to make up for their original mistakes.It took 12 years to finally help the police catch the criminal.

The prototype of Cheng Bing now lives a happy and low-key life. He no longer wears a police uniform. After catching Wang Eryong, Cheng Bing disappeared from public view.Cheng Bing's wife later returned to him with her daughter, and the couple lived an ordinary life in Beijing.Cheng Bing remarried his wife. He heard that the couple had opened a store or training institution in Beijing. He did not want to receive too much attention from the outside world.