Yu Ze was originally just an ordinary high school student, but his peaceful life was broken by a dream he had in class. He saw himself in the dream, but that person brought him a strange news - he was originally the Demon King and told Yuze that his virtual personality would now be replaced. In the dream, he told the dubious Yuze a method to verify the facts (an incredible method of killing). Yu Ze told his friend Wen Li about the matter, and Wen Li suggested that Yu Ze not to verify it and wait and see what happens. Time gradually passed, and Yuze, who had almost forgotten the incident, accidentally used that method and killed his classmates, and all this happened in front of many people...