Cui Tiejun, Xu Guozhu, and Pan Jianghai, known as the 'Trident' of the municipal bureau, discovered a connection between a key suspect in a pyramid scheme case and a murder case from twenty years ago. In order to conduct a thorough investigation, the three veteran police officers, with the support of Director Guo, established the Trident Task Force. With the help of their apprentice Xiao Lu and young police officer Xu Man, the trio assisted various police units in solving multiple major cases, ultimately uncovering the truth behind the twenty-year-old unresolved case. However, as the investigation deepened, the Trident found that everything was related to a criminal group called 'Qingshan Association'. This criminal organization attempted to monopolize the market and reap profits through a virtual currency called 'Yun Miao Bi'. In the end, the Trident faced difficulties head-on, overcoming numerous obstacles, and finally uprooted the Qingshan Association, a criminal organization that had plagued Ping'an Province for many years, capturing the main culprit Zhou Mao. The Trident once again protected the lives and property of the people of Ping'an.