Cheung Lok-Ming, voted the Most Handsome King of Tutors, has many admirers among his female high school students while his wife waits patiently for a marriage proposal. Two of his students invoke the Saucer Spirit to predict the questions in their Chinese History exam. After being two-timed by her boyfriend Ted, Joyce tricks Mr. Cheung back to her apartment where Saucer Spirit bewitches him into killing her and her friend mid-seduction. After dumping the bodies into the sea, he finds himself being investigated by failed cop and toilet connosseur Ma Tung who can't even keep track of his own police badge. But Cheung has other secrets buried 20 years in his past.

Policeman Ted Chan, who doesn't have the best record on the force for cracking cases, suffers from flashbacks after witnessing the suicide of pregnant Irene who dramatically leaps from the roof of her apartment after dousing herself in petrol. When there are two similar deaths in their district, Inspector Yip asks Ted to solve the mystery. The connection is that the victims were all avid users of ICQ and frequently visited the same website. Ted and his colleague Gigi discover that the webmaster is called "God of Death" and that through his chatrooms he enourages his community to commit suicide. While Gigi arranges a meeting with the webmaster, also known as Keith, Ted finds that Inspector Yip has encouraged a young officer to shoot himself in the police toilets...

Wan Fei (Joey Yung) is a promising Chinese Opera singer who is secretly in love with Ho Fung (Nicholas Tse). She plans to sing for him from the stage, but, in a tragic accident, dies mid-song. Years later, Wan Fei's ghost returns, and finds that part of her spirit has been reincarnated in the form of Chor-bat (Eason Chan). Wan Fei still longs to sing her song for her lover, and, after much humorous confusion, her dream is fulfilled.

CIA Agent Harry is bitten by a man who was part of a deadly experiment involving the ability to withstand pain. The bacterium has a virus, causing the victim to become a zombie. Upon Harry's arrival in Hong Kong, after rejection from his ex-girlfriend, the virus begins to take effect. He kills a call girl and is arrested after a gang fight. When he is in prison, Harry transforms into a Zombie King and transforms nearly an entire Triad gang into his personal horde. Soon, the police department becomes a House of the Dead. It's up to a police officer named Marco, Harry's ex, and a Triad member named Cheap to stop them before it's too late.