Thirty years after the revival of spiritual energy, the city is deeply bound to martial arts. It has become a daily routine for students to take pulse tests, companies to raise martial artists, and communities to be rated according to their combat power. Everyone lives in the order of "cultivation for all".
On the surface, the Federation relies on martial arts exams, martial arts schools, and the Department of Public Security to maintain prosperity. In fact, there are "emotional furnaces" buried underground in every city, which can transform citizens' anger, fear, and fanaticism into training resources.
The protagonist accidentally obtains a strange mask that can see the "malicious value", and then discovers that the strongest group of people in the city are not absorbing spiritual energy, but carefully cultivating people's negative emotions.
While he used gag methods to deal with the school, the black market, the Department of Public Security, and the consortium, he was gradually eroded by the mask in reverse, and began to change from a little person who loved to play tricks to a "black chemical weapon madman" who was feared by the whole city.
The core contradiction of the entire story is whether the protagonist should completely become a "carrier of evil in the city": if he does not go dark, he will not be able to save others; if he goes dark to the end, he himself will become the new heart of the furnace.
