Situ Minghao (played by Ren Quan) and Zhao Yong (played by Qiao Renliang) are colleagues and friends who work in the same magazine. The two have known each other for many years and their friendship is very strong. Recently, they focused the magazine on a human organ reselling case. During the investigation and evidence collection, Zhao Yong disappeared unexpectedly. What awaited Situ Haoming afterwards was the news of Zhao Yong's death.

What Situ Minghao didn't expect was that Zhao Yong's death was not the end. Not long after the tragedy happened, the staff of the magazine began to receive death emails from Zhao Yong one after another. What's even more frightening is that those who received the mail really died one after another. The shadow of death hangs over the entire magazine, and everyone is secretly guessing who is the next target of the terrorist killer, and who is that killer.

　　司徒明浩（任泉 饰）和赵勇（乔任梁 饰）是在同一间杂志社工作的同事兼好友，两人相识多年，彼此之间的友谊十分坚固。最近，他们将杂志的焦点聚集到了一宗人体器官倒卖案件之上，在调查取证的过程中，赵勇意外失踪，之后等待着司徒浩明的，则是赵勇的死讯。 　　让司徒明浩没有想到的是，赵勇的死并不是终点，悲剧发生后没多久，杂志社的职员们便开始接陆续收到赵勇发来的死亡邮件。更可怕的是，那些接收到邮件的人们，果真接二连三的死去。死亡的阴影笼罩着整个杂志社，人心惶惶之中，每个人都在暗暗猜测，谁是恐怖杀手的下一个目标，而那名杀手，又究竟是谁