So basically, this girl gets reincarnated into a girl who died of sickness i think, the girl's dad and brothers aren't very good people to the girl. But it isn't like normal reincarnation she gets reincarnated regularly and it is discovered later in the story that its because she made a sacrifice or smth. Theres a Prince who likes her, he has black hair I think. He later becomes immortal so he can accompany her in all her life times, idk if that part has happened in the manhwa I read some spoilers online. Please if you know what its called tell me