After losing his two-year-old son, Lei (Andy Lau) begins a fourteen-year-long quest in search of his missing child. On the road, he makes a stop at a repair shop where he comes across a young repairman, Ceng (Jing Boran), who was also kidnapped at the age of four. Robbed of the life he was meant to live, Ceng can only vaguely remember snippets of home — a chain-link bridge, bamboo trees, and his mother’s long braids.
A crew of seasoned criminals led by the notorious Nam, armed with high-powered weapons, pulls off another smooth and violent armored car heist in broad daylight in a crowded street. Whoever tries to get in their way, they will show no mercy. This puts the police force to shame and humiliation. A hardboiled senior police inspector Lui, hot on the trails of Nam and his tight crew, determines to put an end to this madness that causes the lives of innocent people. But he soon comes face to face with the cruel reality that the usual police tactics are too futile to send these armed thieves behind bars. Extreme crime requires extreme justice, even if it means crossing his moral line. Tou, an ex-con desperate to leave his criminal past behind, volunteers to be Lui’s snitch in exchange for a fresh start with her girlfriend Bing. But little does he know what hellish situation he’s getting himself into.
The movie is set in Hong Kong and the Philippines in 1960. Yuddy, or ‘York’ in English (Leslie Cheung), is a playboy in Hong Kong and is well-known for stealing girls’ hearts and breaking them. His first victim is Li Zhen (Maggie Cheung) who suffered emotional and mental depression as a result of Yuddy’s wayward attitude. Li Zhen eventually seeks much-needed solace from a sympathetic policeman named Tide (Andy Lau). Their near-romance is often hinted at but never materialises.
Chan Wing Yan, a young police officer, has been sent undercover as a mole in the local mafia. Lau Kin Ming, a young mafia member, infiltrates the police force. Years later, their older counterparts, Chen Wing Yan and Inspector Lau Kin Ming, respectively, race against time to expose the mole within their midst.