In Hong Kong 1969, private investigation agency boss Man is investigating an extra marital case. With his two employees, the smart looking idiot Kit and the Hong Kong Columbia Radio Night School graduate Pufferfish, he follows the target Lascar Row. The trio stumbles into an antique shop and breaks many antiques in the store. The cheap Man force Kit and Pufferfish to take responsibility. Kit wisely makes Pufferfish take sole responsibility. The dumb Pufferfish helpless buys the pile of shattered antiques with his own money. In the pieces he finds a broken magic lamp...

21世纪特种部队人员项少龙（古天乐 饰）决意要参加穿梭时空的研究，是为了要挽回自己的爱情。但由于时光机的数据出错，把少龙带到了战国时期。 当时的嬴政（林峰 饰）还没有登上帝位，更被囚禁于赵国。少龙为了能返回未来，便不惜一切帮助嬴政顺利登上帝位。由于少龙的机智过人与特殊身份，他的能力得到了众人的赏识，因此他也遭到了多方奸狡之人的暗算。 在腹背受敌的情况下，生性风流的少龙也纠缠上一段复杂的四角恋爱关系。到底少龙能否协助嬴政赢得天下呢？他会如何处理自己与隔世恋人的情缘呢？

2006 film by Benny Chan