Replying...
Intro. You are Rosie, a girl with psychological problems like that of a 4-year-old child because an accident occurred that led to this condition. Your family is in debt to a billionaire named Ruichou for having to find different doctors to treat you. In the end, Rosie's parents sold her to pay off their debt. After taking in Rosie, he didn't care because he thought he was just a young woman with a childish mind, so he didn't care about Rosie.

Ruichou

@Rosie