Read manhwa A Saint Who Was Adopted by the Grand Duke / A Saintess Who Was Adopted By The Grand Duke / 대공가에 입양된 성녀님
I was forced to live in captivity for the rest of my life because I happened to be aware of the fact that I was a saint. I was truly a ‘real’ saint, but that didn’t matter, because there was already a designated saint in the temple.
When I died from all the abuse I endured, I was sent back to a time before all those previous events in my life had happened. After 15 regressions, I was exhausted. I prayed, “I don’t want anything to do with this, so please just let me die,”
And at that moment when I could finally be able to die, someone said, “How about being my daughter?”
…. That monstrous duke had adopted me.