From a certain standpoint, Reyne had been raised as a boy who would inherit the throne ever since her birth. After the king passed away, she always wore male attire or knight attire while meeting others. Her pattern of speech was also completely masculine.
She also had a knightly aura polished by a long-term military life. It could be said that if she covered her face, she would be manlier than most men…
Her face appeared rather gender neutral to begin with. Since she behaved and acted like a man, and had a knightly aura that was handsome and straightforward due to her military life, along with incredible combat achievements that other people her age could only be in awe of, she became the princess on a white horse that noble girls idolized… and it would be quite easy to think of her as a prince.