
What bothers me the most about this manga is the change in her attitude. It seemed like the author wanted her to have a different personality in the beginning. Plus, who gets raised to be a princess, possible queen, and behave as cluelessly as her?

Try reading this. It has the same premise but the FL and ML are more likable. I like this manga tho but of corz ders always gonna better stories out there. Try this one.
https://www.mangago.zone/read-manga/ai_ga_omoi_kishi_koushaku_wa_tsuihou_reijou_no_subete_wo_ubai_tsukushitai/
Kinda grinds my gears when a character that was isekai'd into a novel they read freaks out about a ML liking someone when they, the anomaly, has already changed a lot of the story. For one, Lucian isn't lonely and his power isn't out of control. You can't expect him to fall for the original FL when those were the driving forces of their connection.
I didn't even touch the fact that he's been hitting on her HARD. Like, com'on. You were supposed to have confidence. At this point, you're being insensitive.