Quick-transmigrator Shen Baiyou, seeking a peaceful life, transmigrates soul-first into the foolish legitimate daughter of the Guarding-the-Nation Marquis's Mansion, planning to lie low in the inner chambers and live a lazy life. Powerful minister Jiang Yingxu, convinced the Shen family is his family's extermination enemy, leads troops to surround the mansion late at night, colludes with a traitor to forge evidence of border military defeat, coerces Lord Shen into signing a crime confession implicating nine familial exterminations, and even speaks out to take Shen Baiyou as a concubine. At the moment of life and death, Shen Baiyou sheds her disguise, publicly dismantles the three fatal flaws of the crime confession, ferrets out the traitor Zhang Rui, and turns the tables to counter Jiang Yingxu on suspicion of deceiving the ruler, forcing him to compensate two hundred thousand dan of military provisions. From then on, she takes charge of the marquis's mansion, purges internal traitors, cracks rumors, and gathers provisions to stabilize the border, counterattacking step by step.