I'd point that this is not a romance fantasy but a fantasy with a female protagonist, and falls under evil protagonist tag. But I hope the dad in this burns in hell not like the dad in that one that is safe and... Reio
Tired of seeing the Evil First Main Wife being more punished than the Unfaithful Bad Husband who never protects his illegitimate children or take any responsibilities.
Actually, I was the Real One.
A victimized Mother summons a demon that takes over the body of her daughter to fulfil her revenge against her enemies.
But this time the demon possessing the girl is the protagonist, not the villain.