张融（范冰冰饰）的哥哥张小春（张家辉饰）是收养的，自小得不到父母的疼爱。但是自从小时候父母被一群流氓入屋抢劫杀害后，张小春就担负起养育妹妹的责任。长大成人后小春和张融的好朋友何乐结婚，生活平静从容。而张融被绝症困扰，要定期去医院复诊取药。人生对于她来说毫无意义，但是她坚持上班工作。一天退还快递时认识了一个酗酒颓废的男人程成（黄秋生饰），意外地在他店里发现了父亲的照相机，程成说是小学同学“小春”卖给他的。张融安排了机会让程成与张小春见面，二人毫不相识。张融怀疑起当年父母血案的真相，她用生命的代价追查到了事情的真相：张小春的脑袋里住着一个寄生人。
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