The story of three old policemen who were once all-powerful. Faced with a new type of crime, they worked together to innovate detection methods and finally broke the financial crime group in one fell swoop.

The Trident of the city police, uncover a link between a pyramid scheme case and an old murder. With the support of their director, they form the Trident Task Force, assisting in solving major cases. As they dig deeper, they confront a powerful criminal group using their traditional methods to combat modern schemes and protect public safety.