小子北京狗跟随骗子无皮柴行走江湖。一日两人接受光棍七的委托去谋杀职业杀手人渣炳，计划是利用人渣炳好色的弱点，以光棍七之美艳妻子实行色诱。岂料当计划进行顺利之际，三人欲下手之时，人渣炳有所发觉，众人落荒而逃……

Lau Kar-Wing plays "Nobody", an orphan who grows up stealing food to survive, learning some meagre skills as a con artist. When he meets a true master con artist, he begs to become a pupil and learn some tricky kung fu. The pair are later separated, and Nobody finds another master to learn more deadly skills.