The scumbag fiance cheats on the heroine with her younger sister and schemes against her at every turn. When she finds out, she breaks off the engagement and enters the palace to take part in the imperial selection, making the emperor fall in love with her step by step. She takes revenge on her scumbag fiance and sister, becomes empress, then serves as regent to the new emperor and works for the people. In the end, she becomes a legendary empress dowager.
