Quick Transmigration: Villain Growth Plan

After becoming a High Lord of the Demon World and binding something called the system, only then did he realize that he was actually the Little Boss of a book that was the villain.
The system also told him that if he wanted to revive and change his fate, he would have to help him cultivate more opposing bosses.
Of course, he would be happy to go back and torture the main character.
Wasn't it just teaching people to be naughty and mischievous?
He's too good at this ~