2017 film by Wong Jing and Jason Kwan

A drug cartel boss is arrested in a raid and coerced into betraying his former accomplices as part of an undercover operation.

Sergeant Tong is wracked with guilt after he unwittingly kills a young girl whilst capuring a criminal named Cheung. When the girl's sister is later kidnapped in a ploy to get Cheung released, Sergeant Tong vows to find and rescue her before she comes to harm.

Living in the guilt of sacrificing his informant in a previous operation, Criminal Intelligence Inspector Don Lee is wary when his superior orders him to send another informant to spy on the criminal operations of Barbarian, a vicious gangster plotting a jewelry heist. He seeks ex-convict Ghost, who agrees to work for Don despite vowing to go straight since he's desperately in need of money to repay a debt and save his sister. Ghost's driving skills help him infiltrate Barbarian's gang and earn his trust, but by feeding information to Don and hooking up with Barbarian's girlfriend Dee, Ghost is pushing himself into a tight and deadly corner...

When the Ronin Gang robs an armored car, three cops — Chan, Fong and Wai — go on the warpath. Each has a personal interest in bringing down Ronin leader Tien: he killed Chan's fiancée, humiliated Fong and kidnapped Wai's brother.