Shen Ninghua, the daughter of the guilty minister, enters the palace as a low-level talent. The harem is like a purgatory, with low-ranking concubines fighting endlessly. She hides her sharp edge, relies on her precise understanding of people's minds to survive in the cracks, and secretly collects clues about old family cases. Forming alliances with seemingly weak allies, dealing with deep-seated opponents in the city, step by step in the calculation of life and death, transformed from an outcast who was trampled on by others, to a strong man in charge of the harem.