The Female Grand Tutor

She is the daughter of the minister of the Jin Dynasty. She bears the blood of the family. She disguised as a boy in the palace for six years as the study partner of the prince. However, she is often trampled on by the man. She is broken by humiliation and tears in her eyes until she picks up the butcher's knife. She is deeply involved in love and intrigue. Is she in love with the callous man? The calm one? Who is the final winner? She, together with them ... how should it end?