Roni, an orphan who grew up misunderstood as a boy. One day, she is chosen by a high-ranking nobleman who comes to the orphanage. To pretend to be a male young master. The moment they found out that I was a woman, I would be sent back to the orphanage. I promised myself that I would be careful and survive. You Are you a girl? It was caught in one day! The truth was revealed as I stood in front of the Duke. No way Was I going to be kicked out like this, or was I going to be severely punished for deceiving a noble? I was so scared that I begged and admitted my mistake. Oh, you look like a doll! You! Be my little sister, not my playmate! Instead, they greeted me kindly? I can because you e too cute! The story of Ronis life in the Dukes castle, who was forced to stay because of her cuteness!