Shen Qingci, the legitimate daughter of the Protectorate General's Mansion, was bullied by Shen Qingrou, the illegitimate daughter of the Protectorate General's Mansion, and her mother, Liu Yiniang, and was abandoned in the wilderness. After waking up, she was rescued by the Prince Regent. Afterward, she reached an agreement with him: the Prince Regent would help Shen Qingci find out the truth and clear her grievances, and Shen Qingci would treat the illness on the Prince Regent's body. During their time spent together day and night, they gradually developed feelings for each other.