Sai Man is a negative person; he thinks that life is hopeless and meaningless. He likes to use a harmonica to play the music that his mother taught him. The music attracts Ah Hua. Classmates of Sai Man make use of their friendship and attempt to rape Ah Hua...
世民自幼萬念俱灰,覺得做人很無聊。面對冷酷現實,他不敢面對,只想逃避一切。世民很喜歡獨個兒吹奏母親教他的口琴樂章,琴聲卻吸引著少女阿花。世民的同學們視阿花為援交少女,他們利用世民與阿花的朋友關係,設下圈套,企圖強行蹂躪阿花......