I am Liu Xiao, an ordinary teacher in No. 1 Middle School, and I am also the "Night Owl" killer who hides among the crowd.
In the shadow of this city, the Shadow Snake uses medical treatment as its cover and conducts genetic experiments. Under the dark network protected by officials, countless children disappear mysteriously. Parents have no way to report the case, and their blood and tears are drowned in the quagmire of power and money. In the gray area where the law cannot shine, the "night owl" is the only light - we use darkness as a shield and a sharp blade as a spear, and practice justice that no one recognizes in the gap between black and white.
Mission: Protect the world, gray justice