《谁知道》是由刘艳杰执导,龙馨悦,梁辰羽,孙乐天,郑小毛,刘京京,宋景奥,闫震宁,姚柯峰主演的动作片。该电影于2017年在中国大陆上映。故事从3名小区保安夜晚巡逻时突遇楼道滴血进而发现灵异事件展开。影片以林紫凝、林勇(龙馨悦饰)为这对双胎姐妹为主线,林紫凝因受他人设套被偷拍不雅视频并传到网上,在极度崩溃下选择了自杀。东海市公安局刑警支队重案队队长陶明(梁辰羽饰)查阅了案发现场资料后断定,这起案件的背后肯定隐藏着惊天秘密。林勇为得知姐姐死讯后,火速赶到东海市,老同学陶明赶到火车站接站,并转交了其姐姐林紫凝的遗物,林勇为深知姐姐性格刚烈,坚定姐姐是被人陷害,并暗自下定决心要亲自查个水落石出,是苍蝇还是老虎,是真的有鬼还是人为作怪……
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