I don't really remember since I read spoiler in comments too. But the FL really want to go back to her world but the only way is the ML need to kill her... At that time they both already in love.. Since he want her to be happy, he willing to kill her. Then, the FL went to her real world but she miss the ML like crazy... She keep crying & be sad. Then, one day she crying in the street & the ML came to help her!!! So they met again but it seem he don't remember her but there's a sense of deja vu if I not mistaken. [I'm sorry if this is wrong because I read many isekai manhwa ] as for the real Eris (not the FL) IDK what happened to her.
I know the ending abt the FL & FL... But please tell me that Crown Prince at least suffer please. I'm this close to isekai in this manhwa & fuking torture him.