十七歲的阿峰與樂仔、牛仔及肥豬，份屬黑社會洪聯社刀疤豪旗下的同門兄弟。峰是最冷靜及勇悍的一個，是眾人中的大阿哥。一天四人與Ｍａｙ及Ｐａｔ到尖沙咀一所的士高內慶祝生日，峰向威哥手下基仔購買軟性毒品，良久藥性仍未發作，懷疑是假藥，於是便找基仔欲討回金錢。怎料對方人強馬壯，指峰等人故意生事，並要峰賠償伍仟元，還將他們打傷，並著令數人從始不得踏入尖沙咀半步。峰四人帶著傷回到屯門向大佬刀疤豪求助，豪責罵了峰...

In the god-forsaken satellite city of Tuen Mun, 13-year-old Cookie suspects she's pregnant. Lately things have not been going her way. Her mother left; her father ignores her; her best friend is in reform school; and her boyfriend is off selling bootleg VCDs in bustling Mong Kok. Flanked by her ride-or-dies Banana, Sissy, and Bean-Curd, she journeys into town to find an abortionist.