Gu Qingning, the legitimate daughter of the Duke of Zhenguo's household, has been married to General Lu Jingxing for years. After sacrificing her ability to bear children to save his life, she is repaid with his cold-hearted decision to cast aside his current wife and marry his childhood sweetheart, Su Hanyan, demoting his lawful wife to a concubine. Gu Qingning pretends to agree to a divorce three months later, but then brings a commandery princess to expose the couple's secret wedding and their scandalous affair. She forces Lu Jingxing to sign the divorce papers and surrender his entire fortune as compensation. After the divorce, she donates grain and supplies, cares for war orphans, establishes a school for girls and opens a medical clinic. Through her own efforts, she earns the title of commandery princess. Her faithless former husband is eventually executed for treason, while she finally blossoms into a brilliant woman in her own right.