张金（樊少皇 饰）是赫赫有名的黑帮马仔，这天，刚刑满释放的他在一家餐馆被人追杀，对方对他连开数枪后迅速逃逸。命不该绝的张金并没有死，惊恐中他在怀疑到底是谁要将他置于死地。经过一番周密考虑，他决定只身调查。首先，他包下了杨言（吴镇宇 饰）的出租车作交通工具，从此，杨言的命运和他綁在了一起。令张金百思不得其解的是自已得罪了谁，非让对方索取自已性命，他锁定入狱前的三个仇家，伹最终又否定了他们是猎杀自已的真凶，张金早年的犯罪生涯被层层剥离开，杨言受雇于张金也是另有所图，故事走向扑朔迷离......When mafia fall guy Zhang Jin finally gets released from prison, he's nearly assassinated. In an effort to survive, Zhang becomes entangled in a conspiracy, linking his fate with unlikely allies and turning friends into enemies. Zhang must discover the identity of the assassin before he gets murdered, without plunging himself back into a life of crime.