A group of police friends are investigating a suspicious fellow officer who might be involved in drugs and prostitution.

The result of a top secret project spearheaded by the Chinese government to create the ultimate soldier, Agent Nieh Ling (Khan) possesses superhuman strength and agility. She's also the only test subject that doesn't go insane as a result of the experiments she's subjected to, so when three of her fellow operatives embark on a rampage of violence in Hong Kong, Ling is dispatched to take them out. After a freak accident erases her memory, the super soldier is taken in by a wisecracking cop and his girlfriend, who nickname their high-kicking new pal "Chun Li." The suddenly-carefree Ling begins to enjoy the lighter side of life, but when her deadly targets surface, Ling and her new friends find themselves in the fight of their lives.

Skinflint businessman Richard (Leung) doesn't feel bad when he sacks his employees and secretary to cut unnecessary costs. He also doesn't bat an eyelid when his gold-digging girlfriend leaves after he refuses to give her money. She gets her revenge by cancelling his credit cards and giving away his furniture. Suddenly destitute, he's forced to rely on the generosity of Choi (Shu Qi), a good Samaritan who helps him out even though she thinks he's a scumbag who makes a habit of cheating women out of money.

After his police pistol falls into the hands of a triad boss, a Hong Kong cop has seven days to recover it, caught between a trafficked woman linked to the gang and his own lover as he clumsily navigates both in a last bid to reclaim the gun.