Pan (played by Yang Panpan) and Li (played by Li Saifeng), two senior police officers, share a deep bond and regard Li's father, San Chai Feng, as family. They cooperate to investigate a criminal gang, but during a chaotic shootout between the police and criminals, although they succeed in killing several gang members, they inadvertently expose the identity of an undercover officer. This incident draws the attention of the gang's leader, who sends assassins Fei and Wei to eliminate the undercover agent.Fei attempts to kill the undercover officer but fails during a shootout with Li, resulting in his death at Li's hands. After learning this news, Wei decides to avenge Fei. He kidnaps Li's sister Anna, forcing Li and San Chai Feng to rescue her. However, during this rescue mission, San Chai Feng and Anna both tragically fall to Wei's attacks, and Li also meets her fate as she is attacked by Wei in the hospital. Pan, witnessing his friend pay such a heavy price for justice, feels deep sadness and anger. He vows to find Wei and engage in a final battle to the death. After an intense confrontation, Pan ultimately succeeds in killing Wei, avenging Li's family.