The story of the movie "The Three Brigades" is based on a real vicious case that happened on August 22, 2002. The victim in this case was a 17-year-old girl who was assaulted at her home by two criminals who had burglarized and **. The criminals smashed the girl with a copper ornament to the point of serious injury, causing her to suffer a severe brain injury and become a vegetative state. Although the girl's life was saved after the doctor's full treatment, she was no longer able to take care of herself.
The case was handled by three teams led by Cheng Bing, the captain of the Criminal Investigation Brigade. Through technical means, they extracted sperm spots from the victim's body and collected fingerprints from the balcony window frame. After comparison and verification, the fingerprints belonged to Wang Dayong, a Sichuan criminal suspect who had a history of theft and was cracked down by the public security organs, while the DNA was matched with Wang Dayong's younger brother Wang Eryong.
Shortly after the incident, the three teams succeeded in capturing Wang Dayong. But during the interrogation, the suspect died at the Public Security Bureau because the police used some tactics against him out of righteous indignation. The incident sparked public outrage and a scandal of torture by the three major teams. Cheng Bing and four other police officers were sentenced to prison as a result, and the three teams were abolished.
However, Cheng Bing never gave up the pursuit of Wang Eryong in prison. After being released from prison after 7 years of prison, he decided to continue to search for Wang Eryong's whereabouts as an ordinary person, and traveled to many provinces, worked as a courier, worked as a night taxi driver, and set up a night market. In the end, after 4 years, after becoming a water delivery worker in Guizhou, he successfully determined Wang Eryong's identity and arrested him.
The movie "The Three Teams" is based on this true story, changing the girl's age to fourteen years old, and aggravating the case to burglary and murder. At the same time, the film also shows the difficulties and setbacks experienced by the three teams in the process of tracking down the case, as well as their spirit of not giving up and not giving in.