Once upon a time, the world was only for humans to inhabit. According to history, the only special creature who oversees the world was a lamb. With the lamb as the guardian of the mortal realm, the world had kept its order for a long time.
Until...
A god, a sinful lower god, had escaped the judgment in the heavenly realm and entered the mortal realm. His existence in the world had born mayhem with his wicked, ferocious, and brutal nature. He sought vengeance on the god and thus, he set forth to meet the lamb to fulfill his plan of vengeance.
Afraid of this sinful beast's return, the god of the moon and the god of the underworld joined hands, and their alliance hatched a creature made of sin. That was how the first vampire was born and it was called the child of evil. The child of evil's only purpose was to slaughter this beast walking freely in the mortal realm.