Ultimate: Black Dragon Adopted Son, I Am the Big Devil!

Duan Yu traveled through the ultimate universe and was adopted as an adopted son by the Black Dragon, known as the Great Demon King of Golden Time and Space. Originally, he just wanted to use the name of his adoptive father Heilong to become a playboy in the supernatural world, but unexpectedly he accidentally activated the villain system. As long as what you do conforms to the villain's behavior, you can get various rewards. Gee, isn't this forcing me to become the villain? In order to protect himself, Duan Yu had no choice but to choose to become a stronger and more ruthless demon king than the black dragon. A few years later, Duan Yu, who unified the twelve time and space, shattered time and space with one punch and stepped into the demon world alone. Looking at the trembling Demon Lord Diablo and the Four Demon Lords, Duan Yu sighed helplessly, knowing that they had a deep misunderstanding. Whether you believe it or not, I am really a good person. Of course, it doesn't matter if you don't believe it. If I can punch you to death, you will naturally believe that I am a good person.