KO One: The Black Dragon's Adopted Son, I'm the True Demon King!

Duan Yu transmigrates into the Ultimate Universe and is adopted by Black Dragon, known as the Demon King of the Golden Dimension.

He only means to use his adoptive father’s name to become a spoiled brat in the ability-user world, but unexpectedly activates the Ultimate Villain System.

As long as his actions fit a villain’s role, he can earn all kinds of rewards.

Tsk, isn’t this just forcing me to become the ultimate villain?

To protect himself, Duan Yu has no choice but to become a Demon King even stronger and more ruthless than Black Dragon.

Years later, Duan Yu, having unified the Twelve Temporal Dimensions, smashes through space-time with a single punch and steps into the Demon Realm alone.

Looking at the trembling Demon Lord Diabolo and the Four Great Demon Lords, Duan Yu can only sigh helplessly, knowing they’ve badly misunderstood him.

Believe it or not, I really am a good person. But it’s fine if you don’t believe me. Just survive one of my punches, and you’ll naturally believe I’m a good person.