Night Owl belongs to the mysterious organization "Purification Institute" that claims to be the "maintenance of order". During a mission, he was shocked to realize that the target was not as heinous as the organization claimed, but instead held key secrets that could subvert the "Purification Institute" and even higher power structures. Hesitation and mistakes made him the target of the organization's pursuit.
In order to survive and explore the truth, Ye Xiao was forced to form an alliance with investigative reporter Su Yao while avoiding the pursuit of his former colleagues. They struggled to pursue clues in the dark corners and heavy fog of the city, and discovered that behind the "Cleaning House" were hidden forbidden experiments involving ancient organizations, and a crazy conspiracy to control life and death and change the world order.
