Tung lives illegally in Hong Kong's 'Ladies Market' after having been taken in as a young child by Shan Lao, a kind street hawker. Living together like a father and son, they are blissfully unaware of the illegal activities occurring around them until Tung happens across a younger girl in the old warehouse that he frequents. Meanwhile, childhood friends Pui Yee and Chi Ho get caught up in a diamond theft. When the pair runs into Tung and Yan Yan, the four find themselves on the run from both the gangsters and the police.

小东是一个非法居留儿童，从小跟着衫佬流落在女人街，每天模仿着正常儿童“扮返学”。他从小便和衫佬相依为命，衫佬待他如亲子。 每天小东都会到衫佬的货仓“寻宝”，再到他的“秘密基地”。这一天小东如常到货仓，却意外认识了“肉参”欣欣，并误打误撞救了她。 与此同时，为了躲避警察的搜捕，黑帮大佬火屎哥插赃偷回来的钻石到货车司机珮怡的货物之中，因为这些钻石子豪与珮怡结“缘”。 一场贼赃与绑架案件交织着错摸，小东得到了一个完整“家”的感觉，四人命运走在一起殊途同归