The Royal Family's Pampered Wildflower

If she had to marry into the royal family, then after much thought, the eldest prince seemed like a reliable choice. He was handsome and refined, with few romantic entanglements. He looked delicate and frail, so he should be easy to handle. Later: ...Wait, I thought you were supposed to be delicate and frail!! She was the person he admired most, the unreachable light in his heart. He wanted to give her all the best things in the world. But she was supposed to be his younger brother's wife. ...Wait, the young lady doesn't want to marry his brother anymore. She says she wants to marry him? A male lead who seems quiet, gentle, and sickly, but is actually obsessive, shameless, and insecure × a female lead who thinks she's a tough, prickly flower but is really a delicate little white flower This is the story of how the male lead raises a delicate little white flower into a tough, prickly one, then makes sure the young lady can never leave him again =ww= Theme: