Chen Zilong (played by Donnie Yen), who has unique skills and extraordinary shots, is an undercover agent who has been lurking in the underworld for many years, as the right-hand man of the boss Changmaoxiong (played by Zou Zhaolong), his body and mind are under great pressure, and the boss has become suspicious of him and threatens the life of Zilong's mother (played by Bao Qijing), he is eager to be reinstated and quit the black CCC. This time, Brother Xiong sent Zilong to the mainland to investigate the reality of Sunny Luo Zhiwei (played by An Zhijie), a member of the organization. Sunny was born in Chinatown, USA, and in his early years, he had been with Zilong, but as he grew older, he secretly hacked Brother Xiong's goods. On the other hand, Zilong's boss Zhang Sir (played by Zheng Zhongji) also ordered Zilong to investigate Sunny in exchange for reinstatement. Who knows that the trip to the mainland is very dangerous, Sunny is cunning and vicious, and the cooperation with the mainland police is often contradictory and conflicting, and the mysterious assassin "Blade" (played by Zhang Hanyu) appears and disappears from time to time, Zilong unknowingly stepped into the whirlpool of conspiracy......