She was once a noble eldest princess, but she was forced to hide in the houling by her biological father. She turned into a beggar. When she returned to the capital, she was placed under house arrest again and lost her freedom. She is his bloody shell. To put it bluntly, she is the nanny who protects him from harm. However, the sword has double edges, and the nanny can also become a group favorite.
Since her biological father does not recognize her identity as the eldest princess, he will change her name to seize the throne.