Nulliitas: The Half-Blood Royalty

I'm a little curious when a girl grows up in a boy's shell, and when she gets married, will her husband feel brotherly towards her? Read Nulliitas: The Half-Blood Royalty / Nullitas ~The Counterfeit Bride~ / ヌリタス～偽りの花嫁～ / 눌리타스 : 절반의 백작 영애 on Manhuastar website.

♥ Summary:

One day, a girl who was raised as a boy has her entire life flipped upside down...
A nameless boy who dreams of, becoming a knight works as a servant for the renowned Romagnolo Family.
One day when he is seventeen years old, the boy faces his first monthly period and his mother tells him that actually, he is a girl. She is Count Romagnolo's Illegitimate child and her mother secretly raised her as a boy to protect her.
When the count finds about his illegitimate child, he decides to use her as a pawn to protect his daughter, Maylene, from an unfavorable engagement. In that instant, the child who has lived for seventeen years without a name is given one, and her life begins to change drastically. Her name is “Nullitas” which means nothing.