Modern wage earner Chu Mo time-travels to the Great Qian dynasty, becoming a matrilocal son-in-law of the Duke's mansion. The male members of the Ye family are framed by powerful nobles, and the female family members repeatedly suffer all kinds of humiliation from aristocratic families. Chu Mo hides his own abilities, entering the Brocade-Clad Guard in a crisis. Relying on his superior intelligence and resourcefulness, he deeply investigates old corruption cases, collects criminal evidence according to law, and brings down wicked nobles. Protecting the female members of the Ye family, breaking court serial conspiracies, and washing away the old grievances of the Ye family. Strictly adhering to his original heart without indiscriminate killing, he climbs step by step in the vortex of power struggles, winning the heroine's deep affection and everyone's respect.