I Became the Mad Emperor

A long but slowly serialized novel, [The Great Human-Demon War], Bang GwangSuk binge read it over and over, infatuated by the majestic world building and story development. One day, a mysterious message was sent to him. [This story ends here. Please use your power to save my world from ruination.] Before he could get an answer to the questions in his mind, a new world was presented before his very eyes--from the perspective of the Mad Emperor Exceltrion that would lead the world to ruins. "That's right. I've become the mad emperor from the novel!"