SPL: Sha Po Lang (, released in the United States as Kill Zone) is a 2005 Hong Kong action film directed by Wilson Yip, who also writer with Szeto Kam-Yuen and Ng Wai-lun. The film stars Donnie Yen, Sammo Hung and Simon Yam. The film was released on 18 November 2005. Yam portrays a police detective who, suffering from cancer and about to retire, resorts to illegal means in order to catch a ruthless triad boss. The title Sha Po Lang refers to three words derived from Chinese astrology that each represent a different star capable of good or evil depending on their position in the heavens. Plot The movie is set before 1997, prior to the return of Hong Kong to the People's Republic of China. Chan Kwok-chung (Simon Yam), a Hong Kong police inspector, has dedicated his career to putting Wong Po (Sammo Hung), a notorious triad boss, behind bars. While escorting a witness with damning evidence of Wong's wrongdoings to court, Chan's car is rammed by another car driven by Jack (Wu Jing), a ruthless assassin. Jack then executes the witness, ensuring Wong Po would walk free. Chan survives with a piece of glass stuck in his head. After the glass is removed, the doctor informs Chan of a tumor in his brain that will soon kill him. Chan becomes even more determined to bring down Wong Po, using any means necessary. Three years later, Ma Kwun (Donnie Yen), a police officer from another precinct, is assigned to replace Chan, who is going to retire soon. Ma will lead Chan's team, composed of Wah, Sum and Lok. The three men are very protective of Chan, who has since adopted the slain witness' daughter, as her mother was killed in the earlier car crash. An electronics shop owner brings to the police station a video tape of Wong Po torturing an undercover agent. In the video, Wong hits the agent repeatedly with a golf club, then one of his men finishes him off. Chan and his colleagues decide to alter the tape, intimidate the shop owner into accusing Wong Po of being the murderer, and eliminate the real killer. Ma, who once beat up a drug trafficker so badly that the latter became mentally handicapped, has vowed to abstain from using questionable means in his career. Ma notices that Chan's team is acting suspiciously, but he still helps