Ching's mother suspects her husband of having an affair, so she kills her husband and commits suicide. Since then, Ching and his younger brother are looked after by their aunt. Gradually, Ching is notorious for drug abuse, indulgence in pornography, and bullying. One day, his friend Kwong is found to keep cigarettes, he begs for Ching's help ...阿政的母親懷疑丈夫有外遇，殺死丈夫，然後自盡。她死前囑託婷姨照顧她的兩個兒子，婷姨視他們為自家人。阿政之弟年幼，婷姨沒有告知雙親已死的事實。他們缺乏管教，終日流連球場。阿政更染上壞習慣，吸煙、閱讀色情刊物及欺侮弱小。阿光之父發現兒子藏有香煙，向學校投訴。阿光以阿政不會受父母責備，哀求他代自己受罪......
