Ok so the mc obviously the S class she was reincarnated after having killed the demon king who was once a co worker who confessed to her(my take is there more to his humanity betrayal) anyways she’s sent to another world where he family is and everybody else from her previous life, her mother left her father after he had an affair(he was drugged but it’s not explicitly stated cause I guess it’s suppose to be some big twist but you can tell if you pay attention) the father became depressed and blamed himself I guess he probably thought he was drunk but knew it wasn’t an excuse and since he felt so guilty he didn’t even investigate, anyways there’s a child from that rape the black hair red eye girl who’s definitely a villain, the ml who turned her previous world to it’s apocalyptic state is here as well and they had a promise that the mc is being stupid about but under stably and not thinking about just labeling him threat, anyways palace schemes for people wanting to take the empress spot or replace the kids with their own etc etc the system is sus but likely has something to do with ML and he is most likely the reason she’s in this new world and that’s gonna be a doozy cause I just know she ain’t gone listen to him, like I said the red eye black hair child that came from the drugged rape of the emperor is definitely the real big bad, this is all I believe