In Shanghai, an aging socialite's infatuation with her ex-boyfriend manifests itself as a risky game, where her former lover agrees to seduce, then abandon a naive young woman.

Sui Wai lost her fiance Ah Man in a car accident. With the obligations of life sitting heavy on her shoulders, she lives on only to find herself confiding in her beloved through a phone call. Dai Fai. a mini-bus driver who witnessed Ah Man's death, is always there offering her attentive encouragement and support, yet he himself also lives in the shadow of his last relationship. When Siu Wai strives to face the future without the man she loves, Dai Fai finds himself steadily falling in love with her.

Hong Kong nihilism. December 22, a street quarrel leads to the death of a gang leader's son. Next day, he seeks revenge on his brother, a rival boss. He calls on Liu, a fixer, to import a hit man from the mainland. Lai Fu, a tough and youthful hick, arrives with a day pass. The cops, led by the morose Milo, hear about the killer; they open a full-scale Christmas Eve operation to find the warring brothers and Lai Fu. Lai Fu rescues a hooker, Dan Dan, from a sadist and asks her to help him find his way around Mongkok. By nightfall, Liu has double crossed Lai Fu, the brothers are hiding, the cops are everywhere, and Lai Fu and Dan Dan are on the run. Peace on earth, good will to all?