Su Nan accidentally came into contact with a game called "Demon World" and obtained a unique talent. Just as he thought he would showcase his skills in the game, he discovered various signs indicating that the game he played was not simple. Rampaging players, immortal demons, possessed monsters... All sorts of incredible things happened one after another, and the real world gradually became bizarre. Sensing the danger around him, Su Nan decisively chose to secretly develop himself. When the game merged with reality, he looked back and realized that he had long become the biggest demon in the eyes of the players.
I thought this was the written version of the graphic novel with the same title but it appears to be plagiarized. The chapter numbers don’t match up so one thinks that the graphic novel is being completed after it. But that’s not the case. I believe from what I’ve read that this is being stolen from the graphic novel.