Lo Ka Yiu, a young ad designer who is sentenced to jail for manslaughter, has gotten himself in trouble with the corrupted wardens and fellow inmates of Triad background. Chung Tin Ching, a veteran inmate and Yiu's mentor, is forced to confront his comrade's enemies time and again, leading up to the final showdown with the head of security.
Prison on Fire is a 1987 Hong Kong prison film directed by Ringo Lam and starring Chow Yun-fat and Tony Leung Ka-fai. Yiu is a young advertising executive in Hong Kong. One night, defending his father from attack, he accidentally shoves a street thug in front of a bus. Sentenced to three years in prison, Yiu is "fresh meat" for the hardened criminals and triad stooges that run things, and is preyed upon by sadistic guard Scarface. The virtuous Ching befriends Yiu and becomes an ally. A sequel, Prison on Fire II, was released in 1991.