Demon Slayer: I, the Demon King, Want to Change Everything

(Ghost King's strength + system (low sense of presence) + new six-digit string + passionate battle + make up for regrets + no knives + everyone survives + self-created plot + partially changed plot) Han Xia is a loyal Demon Slayer fan, but Mr. Crocodile is a bit cruel and has thrown away too many good characters: "Teacher Crocodile, you are so cruel! You actually killed most of the key characters in one chapter. I am not willing to accept it! If I could travel there, I would definitely be able to change that ending!" However, God seemed to favor him, miraculously traveling to the world of demon slayers, and with the arrival of Goldfinger (the presence of Goldfinger in this novel is relatively low), he gained the same level of power as Muzan Oniitsuji, and was also the second King of Ghosts after Muzan! After that, he inevitably experienced many things, but he also chose to reach a superficial cooperation with Muzan (actually the two fought, but there was no winner), and he was also secretly developing his own companions, strategizing for hundreds of years, just to wait until the beginning of the Demon Slayer plot, and to eradicate Muzan together with the strongest demon slayer team of the contemporary era! Wuhan: You guy, you actually betrayed me! He actually went to join the Demon Slayer Squad, why? Isn't it bad to be the ultimate creature? Why cooperate with stupid humans! Han Xia: You are a disgusting guy who is worse than a dog. You still have the nerve to let such a barking dog go. Go to hell! The wonderful story begins here... (This is a new author, please don't comment if you don't like it, please understand)