Ultimate: Black Dragon's adopted son, I am the true Demon King!

Duan Yu transmigrated to the Ultimate Universe and was adopted by the Black Dragon, known as the Great Demon King of the Gold Dimension. Originally, he only wanted to use his adoptive father's name to live the life of a spoiled brat in the world of superpowers, but unexpectedly activated the Great Villain System. As long as his actions conformed to villainous behavior, he could obtain various rewards. "Tsk, isn't this forcing me to become a great villain?" To protect himself, Duan Yu had no choice but to become a Great Demon King stronger and more ruthless than the Black Dragon. Years later, Duan Yu, who had unified the twelve dimensions, shattered spacetime with a single punch and stepped into the Demon Realm alone. Looking at the trembling Diablo Demon Lord and the four Great Demon Lords, Duan Yu, knowing their misunderstanding was profound, sighed helplessly. "Whether you believe it or not, I'm truly a good person. Of course, it doesn't matter if you don't believe it; take one of my punches and survive, and you'll naturally believe I'm a good person."