Shen Qiulai, the demonic cultivator hated by everyone in the cultivation world, was ambushed and killed by a female demon. Reborn in the past, he figured it wouldn't be hard to find future demonic cultivators in the righteous sects.
Shen Qiulai: "Let me test you. What would you do if a disciple in your sect became resentful because their stipend was cut in half?"
The gentle and considerate junior sister: "Why do disciples need stipends? The sect has already given them the opportunity to train. They still want a stipend? If they hold a grudge, kill them all. Use their souls for cultivation, and turn their bodies into rations to reward obedient disciples."
The stunning senior sister: "We could turn the disciples into human bombs. Any disobedient disciple should be sent into another sect and detonated. That way, no one could trace it back to us!"
You're all such monsters, how am I supposed to figure out which one of you will become a demon lord? Wait, you're all demons!