三宝（段博文 饰）是游荡在北京城的一名普通青年，遭遇女友背叛后，他一下子失去了生活的意义，随后他丢了工作，被房东赶出门，他甚至想到了轻生。幸好，三宝身边有个好哥们王铭（吕聿来 饰）一直支持他。因为一个意外事件，他们遇到了酒吧乐队主唱柚子（李昕芸 饰）以及男扮女装的舞者小诗（时诗 饰）。身为这座城市的外地人，他们四个年轻人格格不入，生活在都市的夹缝，有着各自的烦恼和困境，始终处于一种失意者的状态。他们遭遇过背叛，也忍受过凌辱，见证着身边的人来了又走。
生活没种，精神有种。四个年轻人互相扶持，彼此照顾，并没有因为命运的嘲弄而放弃追逐美好，在没有光明的地方，他们以黑暗为灯。

Twelve-year-old Dre Parker could have been the most popular kid in Detroit, but his mother's latest career move has landed him in China. Dre immediately falls for his classmate Mei Ying but the cultural differences make such a friendship impossible. Even worse, Dre's feelings make him an enemy of the class bully, Cheng. With no friends in a strange land, Dre has nowhere to turn but maintenance man Mr. Han, who is a kung fu master. As Han teaches Dre that kung fu is not about punches and parries, but maturity and calm, Dre realizes that facing down the bullies will be the fight of his life.