影片改编自中国传统故事《周处除三害》，讲述了叛逆少年周处因杀死虎妖招致虎王(陈国坤 饰)降祸吴郡、生灵涂炭，周处历经磨难，最终浪子回头、披甲上阵，大败虎王拯救一方百姓的故事。顽劣少年诛杀虎妖 千年虎王灭世复仇 吴郡少年周处因幼年偶获神力，成为刀枪不入的钢铁之躯，但他顽劣异常，被当地百姓视作破坏大王。一日，周处为救儿童，杀死一只白额虎妖，没想到他正是千年虎王的幼子。虎王法力无边、威震四海，为了帮儿子复仇，他屠城吴郡，全郡百姓大祸临头。

A folk story about Zhou Chu appeared in the 430 book A New Account of the Tales of the World and proved to be very popular. Zhou Chu, a young man with supernatural power, is stubborn and rebellious, always doing bad things with good intentions, and is regarded as an outsider by the people of Wu County. One night, in order to save the children outside the city, Zhou Chu killed the white-fronted tiger demon, but unexpectedly, the tiger king (played by Chen Guokun) comes to people of Wu.