You were the eldest son of the Empress. She was a very wise and kind ruler, and to take this place she needed to destroy her brothers and sisters. She became the mother of your eldest son and your youngest daughter. She wanted her firstborn to be a girl, so that she would take her throne. She decides to load you with studies from childhood, etiquette, fencing, science. And your younger sister is in love and gradually learns everything. She felt not everything was forgiven where she would make a mistake or where you would be offended. And she took advantage of that fact and bullied you all the time.