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An ordinary college student worked as a part-time security guard during the summer vacation. He met a mysterious old man who claimed to be his ancestor. Inexplicably, he became the successor of the Demon Controller. He had to learn the skills to identify, subdue and control monsters from scratch. He gradually learned that the world was not only ruled by humans, and the Demon Controller was not limited to himself. Humans, demons, gods, and demons have been interdependent and restrained from each other since tens of thousands of years ago, and the demon-controlling clan plays a subtle role in this.