夫妻的史都耀（李国煌）和钟离春（杨雁雁）在茨厂街经营福建面，时常面对殖民地警察及帮会的勒索和欺压。都耀误打误撞之下结识了一个神秘的美女高手小菊（童冰玉），更被指为明朝建文帝的子孙。而深藏不露的离春和陈坤（黄明志）也在这时显露了高强的武功。伴随而来的是各门各派的虎视眈眈，誓夺连他自己都不知道存在的藏宝图。顿时茨厂街风起云涌，高手云集。到底都耀能不能解开自己的身世之谜，并搭救一直默默保护他的老婆呢？

Zhang a middle aged man struggling with a dead end job as an insurance sales person, on the verge of divorce with his wife, losing custody of her daughter and on top of all this he had to take care of his father who's suffering Alzheimer's. Unknowingly Zhang was invited to join an underground fighting game for financial purposes but eventually Zhang becomes hooked on the fights and turns professional.