Donnie Yen directs and stars in this stylish thriller as Cat, a hit man who has entered into a kind of mid-life crisis. Prone to contemplating life in between hits. Cat seems to vacillate between throwing himself into his work and running away to Australia. However, his life gets more complicated when he falls in love with a beautiful policewoman. 孤独者,翩翩起舞。NO ONE IS INNOCENCE。Theme of Cat。这个杀手不太冷。我就这样爱了你很多年。杀手的柔情谁能懂。如何能离开失乐园,能流连忘返总是情愿。嘘! 杀人的事,不该跟陪你跳舞的人讲。無辜的定義。 寂寞的都市夜,电台DJ西蒙(雷宇扬 饰)时常接到听友Cat(甄子丹 饰)打来电话倾诉衷肠,Cat挂线,拿起枪变为冷血杀手,他冲入一幢大楼,将目标人物和保镖们全部击杀。女警Carrie(吴辰君 饰)所在的小组接手此案,每日收听同一档节目并且对Cat的声音颇为熟悉的Carrie并不知道,Cat的形象早已出现在她的脑海…… Cat在执行新任务时偶遇故交Wesley(黄家诺 饰),原来两人曾同为美国警察,Cat因Wesley的背叛失去了一切,沦入不能回头的杀手生涯。Cat误会Carrie是Wesley女友,将其带走,向她袒露了自己的孤独与绝望,二人在天台山跳了一支寂寞的舞。不久Wesley挟持Carrie闺蜜要挟,Cat决定为Carrie孤身犯险。