
The FL, yes that simping soul inside libertia's body is from that world. Her name is Alicia, their mother gave bith to white haired purple eyed girl which is libertia unnie and a black haired purple eyed which is the simping soul right now Alicia. Alica (FL) was weak so she was seperated from libertia unnie to get treatment, this is where things got fck up by the uncle. Both girls was experimented by their uncle the real villain of this manhwa. The reason is he wanted to use them to gain immortality, both of them have powers so that's the reason. Libertia moved the FL's soul into a different dimension and their she also saw that the fl is going to die so she bring her back to their original world (The novel). Novel was actually created by Libertia so that the female lead will read it in the other dimension (she simped towards her sister lol). She also choose to have a different FL in the novel so that Alice (her sister) wouldn't know what she was going through. The book was made to connect Alice (FL) to her sister Libertia.
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The successor for the crown doesn't have the blood of the emperor, he's not a biological son. But the emperor makes him the crown prince because he loves his mother so much that he even accept a boy who doesn't even have a single blood as him. Yes, libertia should have the Rights towards the throne WHICH the crown prince give up towards her but she refused it. Also the fl is really libertia's twin sister(╯°Д °)╯╧╧