
A small spoiler that doesn't give away the story is that the "novel" contents are to be taken with a grain of salt. There's lies mixed in, like the family killing her when learning she isn't their blood, is false. The Duke knew the entire time whose daughter she really was, I'm pretty sure the Duchess was aware as well to some point. There were mild hints here and there for that part.

In her first life she dies, her mom then send her to korea where she also died and come back into the world of her first life this time. She is the savior so she needs to live and fight the evil god. Her mom can see the future so she made some arrangements so that she doesn't die and Ian is helping in protecting her since he also remember the first life
just finished binge reading. so how could they kill her off after finding out her powers in her past life? her manifesting powers from another ducal family means shes still a young duchess, and from a family with no existing heir at that. that had to have smelled like the start of war yknow? i cant believe the duke of perdia would be so thoughtless and arrogant as to kill off the only heiress to the severes and expected no retaliation on his way. with what excuse would he offer?