Why Did the Emperor and Empress Rebel?

Yi Chuan transformed into the heroine of the same name in an ancient sadistic novel. The original heroine prepared to have a "three lives and three lives" peerless sadomasochism with the current emperor Yu Yuan with the script of family destruction. She was a complete love brain. But at this time, Yichuan was looking at the Qingzhou Temple that he was planning to take over when he was eighteen years old, and at the ineffectual Heavenly Palace above his head, and he couldn't help but have a question: Why didn't she seek to usurp the throne despite her strong military strength?