The story is about a mysterious assassination organization that is good at staging assassinations, and every time they kill their targets, they plan their actions as if they were accidents. However, the organization's moderator, Brain, has started to be confused because of the increasing number of killings, and he not only has more and more mistrust in human nature, but also suspects that an ordinary insurance agent, Chan Fong Chau, would be detrimental to him. Brain decides to strike first and plans a series of shocking "accidents", but he never expects to see a reversal of the ending, who is the murderer and who is the victim, and it is hard to tell the difference between the real and the fake.