Karma, reincarnation.
There is a so-called cause and effect for everything anyone does. The more debts you bear, the consequences will come naturally.
Can the evil cult leader who advocates the evil nature of human nature still be able to gain a foothold in your views despite incidents one after another?
The protagonist is as strong as a dragon and can't defeat him even if he tries his best. The protagonist's emotional growth direction.
Concept: OC short story