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.
In 9th century China, a corrupt government wages war against a rebel army called the Flying Daggers. A romantic warrior breaks a beautiful rebel out of prison to help her rejoin her fellows, but things are not what they seem.
In the late 21st century, a subculture of humans have emerged who have been modified genetically by a vampire-like disease, giving them enhanced speed, incredible stamina and acute intelligence. As they are set apart from "normal" and "healthy" humans, the world is pushed to the brink of worldwide civil war aimed at the destruction of the "diseased" population. In the middle of this crossed-fire is - an infected woman - Ultraviolet, who finds herself protecting a nine-year-old boy who has been marked for death by the human government as he is believed to be a threat to humans.
