
The previous reply is right its a little iffy with the timeline but i think before their mother died some god (im assuming dragon linege) saved the mc and the mc was born and just kinda kept in the palace. Its really weird cause she lived in the palace like normally just her family didnt know she was family. Not like she was a servant or anything she just kinda… lived there and ig no one thought to check who this random child is?? Its very weird mb i should reread from the beginning but she is legitimate

No i mean, according to the novel. The man who adopted her is her biological father.
If you go through the spoilers or read the novel, I remember that the man who adopted her within the main Etam family is her biological father and his two sons are her biological older brothers. The wife of that man passed away before she could even give birth to Ayrin so he believed his child is died and buried them both together until a dragon came and save Ayrin who is in the verge of death and return her to the Etam family where she was concluded to be the illegitimate daughter of a distant foolish relative. I remember reading this part. It was so sad, but I somehow forgot how he found out.
I need someone to remind me is she the illegitimate child of a family member or not related to the family?