I Became the Mad Emperor

[The Great Human-Demon War] is a long, slow serialized novel that Bang GwangSuk binge reads over and over because of the magnificent world building and story development. He received a cryptic message one day. [This is the end of the story. Please use your power to prevent the destruction of my world.] A brand-new world, viewed from the perspective of the Mad Emperor Exceltrion, was shown to him before he could get an answer to the questions in his mind. It would lead to ruin. "That is correct. I've transformed into the novel's mad emperor!"