Gu Mingyu is a concubine-born daughter who has long endured oppression in the Gu family. Crown Princess Huo Lingyi publicly declares she does not wish to bear children. Seizing this opportunity, Gu Mingyu enters the Eastern Palace as a secondary consort. She originally only wants to secure her own future, but finds Huo Lingyi gains fame as a liberated woman by claiming childlessness, while secretly preparing conception medicine and hiring midwives, waiting for the Crown Prince and Empress to beg her. After Gu Mingyu conceives the Crown Prince’s third child, Huo Lingyi plots a staged drowning, hides musk to harm her pregnancy, and even pressures her to give up one of her children. Faced with pressure from the Gu family and malicious rumors, Mingyu uses account books, medicinal prescriptions and witness statements to tear apart Huo Lingyi’s hypocrisy. She defends her right as the child’s birth mother and finally obtains justice for herself and her birth mother.