In the eastern part of the country, an emperor rules, and his wives and servants live in a large courtyard known as the harem. Maomao, a modest girl who was raised by her father, a pharmacist, in a small town, never imagined she would be near the ruler. But one day, she was sold into slavery. Despite her ordinary appearance, Maomao possesses a sharp mind and extensive knowledge of medicine. However, she is in no hurry to reveal her secret to the other residents of the courtyard.