She loves him and is about to confess her love to him, but unexpectedly learns that the person he is going to marry is her sister. If it was her status that made her fail, she would accept her fate, but it was her feelings that made her lose, and she would not accept it.
Obviously they met him together, so why didn't she get his love?
She mixed the charm potion into the wine and took him to bed. After a night of lingering, she realized how completely she had lost.
But she couldn't give up and tried her best to marry him. She succeeded.
She did all the things that a supporting female character in a novel would despise, destroying his marriage but losing everything she owned at the same time.
She asked herself if it was worth it.
Conception: