
i also got confused abt it but i ended up kind of getting an idea of what it meant after reading up to the latest chapter. idk if you finished reading the entire thing so idk if this might be a spoiler or not, but it might have been ayna posessing rose, which would make sense bc ayna is still really mad abt ranon betraying her and killing their children.

Anya/Gold, the ml's ancestor, she is the one that is in charge of who gets the blessing, and she saw how much the ml loved fl so she possessed the fl to bring her into the palace and do whatever she can to protect the ml and ultimately sacrifice herself trying to save the ml.
When fl says "she" has to get revenge on the kartazen who betrayed her, it wasn't roan who said that, it was actually anya saying that because she possesses some of the fl to make sure she stays in the palace.
In chapter 34 what does the fl means when she says she has to get revenge on the kartazen who betrayed her