
You can find a lot of spoilers in this forum (⌒▽⌒)
https://forum.novelupdates.com/threads/miss-not-so-sidekick.81455/

Are you sure ? Perhaps I never saw these spoilers but with other spoilers I interpreted the situation differentely :
At first, all the 3 ml were drawn by Ibelin because of the original plot of the book but Latte comes and her presence changes the plot. Arwin and Kenneth realize gradually that their feelings for Ibelin are not trully love, and that they were attracted to Ibelin by some "mysterious force" (which is the initial plot of the story). And Arwin is the first to realize it when he starts to compare Latte and Ibelin in his heart which make him think : "why Am I interested in Ibelin in the first place?" and makes him realize that he doesnt love her at all not he is even interested in her, it's just that he saw her give some money to a kid which reminded him his childhood in the street (which was THE element of the og story to explain why Arwin was interested in Ibelin.
Ibelin kind of feel that she was "borned To be love", but I dont think she did anything to attract the 3 Ml. It's just that for her, everyone always loved her in her life (or were jealous of her), so obviously it's natural that the 3 Ml too. That's why she feels confused when Arwin and Kenneth give attention to Latte and not her. She is actually quite pitiful, because she doesn't know gif to live without being love since this is what que always knew because of her background as the Female Lead.
Perhaps you are right, and if these spoilers are true then Ibelin is the cliché "evil Fl" in this type of story, but for now I see her more like a victim of the plot, who feels that the 3 Ml are supposed to love her but can't explain why.
Sorry I wrote a lot ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
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I'm a bit sad about spoilers I've read about the prince in the novel. He is a trash and superficial, and even if he takes Ibelin as his queen he will not make her his empress because he is tired of her. She will have to bear his son to have his attention back... honestly I never saw him as a potentiel Ml for Latte but unlike some people I like him and their relation. They are funny together, I imagined they would be good friends, but he becomes such a trash that I've read Arwin erases his memories of Latte at the end of the story. The prince sees a maid with blond hair and it reminds him someone but he doesn't know who since he forgot her.
Quite sad for a character who is quite nice and funny in the Webtoon to have this trash-ending ╥﹏╥