Now a fugitive cop killer, Ka Kui must try to catch Chu Tao and clear his name.
Using a corrupt policeman, Inspector Man (Kam Hing Ying), Chu Tao is able to frame Ka-Kui for the murder of Inspector Man. Though Chu Tao is released on bail, he wants revenge against Ka-Kui. She sneaks away while Ka-Kui is sleeping and is not present for the crucial court date the following day. Meanwhile, Selina has discovered that the attack by the man with knife at her apartment was a sham, and so she decides to not cooperate with Ka Kui. Ka-Kui is later able to explain to May that Selina is a witness, but only after much bumbling and further misunderstanding. May, seeing the scantily-clad Selina, misunderstands and becomes angry with Ka-Kui, shoving the birthday cake into his face. When Ka-Kui arrives at his apartment with Selina, who is only wearing lingerie, he is surprised by his girlfriend, May (Maggie Cheung) and her friends, who are throwing a birthday party for him.
After Ka-Kui and Selina leave her apartment later that evening, they are attacked by some street thugs, whom Ka-Kui is able to defeat with his martial arts skills, though the fight leaves Selina's car a wreck. At first, Selina insists that she does not require protection, but after Ka Kui has a fellow policeman break into her apartment and pose as a knife-wielding murderer, she becomes more cooperative. His next assignment is to protect Chu Tao's secretary, Selina Fong (Brigitte Lin), who plans to testify in court about Chu Tao's illegal activities. Later, Ka-Kui is reprimanded by Superintendent Li for letting the operation get out of hand, but is subsequently presented to the media as a model police officer.
THIS IS THE POLICE 2 PLOT DRIVER
He then manages to get in front of the bus and bring it to a halt by threatening to shoot the driver with his service revolver. Ka Kui catches the bus and initially is able to hang on to it using an umbrella, but is thrown off. Ka-Kui persists in his chase, eventually following on foot as the drug lord attempts to escape in a double-decker bus. However, the criminals spot the police and the ensuing car chase cuts through the hillside shanty town, vehicles destroying the shacks and causing large explosions. Inspector Chan Ka-Kui (or Kevin Chan in some versions) is part of the operation, along with undercover officers stationed in a shanty town.