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One year younger than the protagonist, she is a strong-willed princess feigning innocence.
Because she's too selfish she was sent to Japan to study manners.
Her everyday behavior is poor, but when she's doing things like going out in public or meeting public figures, she can play the part of the perfect princess.
When she finds out she has an older brother, she goes to live with the protagonist.

Her Chinese martial arts special skill is that she's a bajiquan user
Hides her hobby of embroidery and her like of fortune-telling
Dislikes cars because she gets sick, and basketball because she's short