On 1949 October 1, the day of the founding ceremony of the People's Republic of China, Xiao Dali enters the city and is reorganized as the director of the public security police station. He finds that primary school teacher Feng Jingbo is full of doubts. With the high vigilance of a soldier and the sense of responsibility of a public security official, Dali insists on partnering with Feng and becomes his neighbor. He then spends his whole life carrying out a nearly four-decade pursuit without regrets.

Documentary about China's film industry and the monumental changes in the past 40 years from beginning with propaganda films to the "5th generation" filmmakers and beyond, who embraced art and commercial films to make China the second largest box office market in the world after Hollywood.

The masterminds behind the scenes attempted to unfreeze billions of assets, not hesitating to hire yakuza forces to launder money by extreme means. Behind everything lies a more intricate and complex criminal network and connections. In the face of the temptation of rivals and difficulties, "Trident" can firmly believe, hand in hand to solve the case, to bring the criminals to justice?

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