一具无头女尸浮出水面，警方将目光锁定在了嫌疑人高飞（印小天 饰）身上。经过讯问，他们发现高飞并非凶手，但也绝不清白。原来死者名叫林燕（汤嬿 饰），她与高飞在网游中相识，日久生情的两人开始了一段不伦的恋情，而为了纪念，高飞将此过程拍摄了下来。没想到，这段视频被林燕的丈夫程涛（李易祥 饰）发现。愤怒的程涛匿名在网上声讨高飞，一时间群情激奋，事态一发不可收拾。网友们人肉搜索出了林燕和高飞的真实信息公布于网上，甚至对他们发起了网络通缉令。无奈的高飞唯有隐姓埋名远走高飞，而脆弱的林燕选择了自杀。 　　刑警张瑶（冯波 饰）目睹了整个事件，这场闹剧引得她深深的反思，当网络暴力凌驾于道德和法律之上时，这个世界还会好吗？

Zhang Yao, the leader of the Haidao vice squad, accidentally captured suspect Gao Fei, who used a fake ID. According to his confession, Gao Fei is a player of the online game "World of Warcraft" and he once met a beautiful young woman Ju Yue at a party. They began to date. One night, Cheng Tao, Lin Yan's husband, unexpectedly found the saucy chat record between Gao Fei and his wife. In a blaze of anger, he posted an anonymous letter online condemning them . His story drew more attention than expected. Net-friends started a "cyber manhunt" and the private information of Gao Fei and Ju Yue were posted online. They also issued a wanted circular for Gao Fei and Ju Yue. To protect his family and himself, Gao Fei lost his job and hid on an island with a fake ID. After Gao Fei left the police station, Zhang Yao answered a call that a headless female body was found on the dock.