Su Wantang, the fake daughter of the Prime Minister's Palace of the Great Yong Dynasty, was driven out of the house by her evil stepmother because of the return of the real daughter Shen Qingge. When she was attacked on the street, she awakened the "merit record" system. She accumulates merit by doing good deeds and exchanges for rewards such as medical skills and martial arts. Step by step, she slaps her stepmother in the face and exposes the hypocrisy of the real daughter. At the same time, she goes from a substitute contract to a fake act with the evil and violent Zhenbei King Xiao Jingheng. In the end, she uncovered the conspiracy of the Queen Mother behind the scenes, regained her status as a princess of the former dynasty, and gained love and career.
