When Cui Tiejun, Xu Guozhu and Pan Jianghai, known as the "Trident" of the city bureau, were investigating a pyramid scheme case, they discovered that the key suspect was involved in a murder case twenty years ago.In order to thoroughly investigate the case, three veteran police officers established Trident Studio with the support of Bureau Guo.With the cooperation of their apprentice Xiao Lu and young female police officer Xu Man, the three elders assisted various police departments in solving many major and important cases, and the truth of the suspicious case twenty years ago was finally revealed.

However, as the investigation deepened, Trident discovered that it was all related to a criminal group called “青山会”.And this criminal group is trying to monopolize the market and gain profits through virtual currency such as “Yunmao Coin”.In the end, Trident faced the difficulties, broke through numerous obstacles, and finally uprooted the Qingshan Society, a criminal organization that had been entrenched in Ping'an Province for many years, and the principal culprit Zhou Mao was captured and brought to justice.Trident once again protected the lives and property of Ping An people.