Lin Chen time-travels to become the eighth profligate son of the Duke Protecting the Country, activating a family system to gain super-strong strength and helpers. To uncover the truth behind his father and brothers dying in battle and revitalize his family, he outwardly maintains a playboy image while secretly uniting with the seventh branch to counter villains like the Second Prince and the Cui family. Through trials such as breaking off engagements to assert prestige, punishing traitors, seizing industries, and cracking conspiracies, he gradually takes charge of the family and military power, ultimately exposing the astonishing secret behind the northern war to protect his family and dynasty.