I think she’s not biologically related to them, but yeah, I get your point
Nope, not really...
Forming a bond as siblings is more than just being registered as siblings, not only they aren't biological siblings, but they also never interacted as siblings, the only ones who have formed a family-like bond with her and treat her like their sister are the sixth and seventh prince, so idk why everyone is hell bend on hating that the
The ML is actually one of her ' brothers'
Not to mention that most of them already know she's not their sister by blood.
arent they all siblings……