
Well, if we reread the story, Jeannette is born by a curse send Athy's father right ?
And we know that her existence will kill him later..
All of this started with the sin of her mother and will surely end with the dead of one of those three..;
-The Emperor
-His bro
-Jeanette
Unless Athy find a way to save everyone, and let Jeannette live with the Emporor big bro as her father..

In the novel when she found out it was even worse (if you want the whole resume check on novelupdates, the spoiler section)
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She was jealous of Athy once Claude regained his memories. She went to him and revealed her jeweled eyes. Claude wasn't even a bit surprised and told her that he wasn't his father and neven will care about her since he will only care for Athy in his whole life. She didn't took the news quite well and her black magic went berserk, she almost killed everyone around her and told Athy she stole everything from her. She really hated Athy because she knew everything from the beginning and blamed her.

Oh if you mean that thing about her reversing time to give Athy another chance, that never happen ╮( ̄▽ ̄)╭ Differently from the manwha, in the the novel Athy was not the original one and Jeannette never used her black magic to reset the world. It was just a fanfiction, but people believed it was real and started spreading it as Canon.
Ok so I know everything about jeanette, and bout how she really isn’t bad, but shes a fucking door mat.... I can’t help but dislike her yk? She really isn’t helping anything, and she doesn’t know how to read the room!!!! She also tries wayyyy too hard. Like athanaisa tried finding different ways to stay alive. Jeanette constantly acts the same way, despite anything that happens! It pisses me off!!!! Shes so naive. It kinda puts the story off. Like if you think about it *spoilers* all the conflicts are her fault due to how naive she is. Its off putting, and I feel like the only reason she exists is to create conflicts when she doesn’t mean to. And like if she finds out, imagine how shes gonna act. Like shes gonna run away and hide. Forcing the others to chase after her. For *her* problem. But this is how I see her. Sure there are good things about her, but im pinpointing all her flaws which are the reason why I don’t like her.
Shit this is really long, but I believe in it