I thought that she was his irl sister
Eh- You've gotta be joking. There's no way in hell that's his sister. Jesse is the only "outsider" meaning everyone else is a character/person that was originally in the world's novel. Plus, Christelle said(when she was hallucinating) that she has(well, had now)a sister back in her former life. Jesse only had a sister(Eunseo) and a brother(Hyunseo or something like that) in his previous life. That means that there's no way Christelle can be Eunseo and have a sister at the same time since Eunseo only has two brother(Yeoseo- aka Jesse and Hyunseo), and no sisters. Sorry I made this so long, just wanted to make sure I explained it thoroughly. Hope this clarified some stuff.
This makes me so happy, I thought that it was going the other way.
Haha- Yeah, incest would definitely be the worst outcome.
can...can they just go poly??