Shen Linlang, the concubine of the Hou family, witnessed her biological mother being poisoned by her step-brother when she was seven years old. In order to survive, she began to act ugly and stupid - smearing pot ash on her face, wearing rags, laughing and drooling when she saw people. For eleven years, no one in the Hou family regarded her as a human being, and this became her best protective color. When she was eighteen years old, her stepmother planned to marry her as a legitimate daughter to the Gu family, the richest man in Jincheng, in order to seize the dowry list left by her original wife. Gu Yanzhi, the eldest son of the Gu family, appears to be a sick boy, but in fact, he is secretly investigating the shady story of his stepmother Liu's collusion with her relatives to embezzle the Gu family's property. On their wedding night, Shen Linlang discovered that this "sick and weak husband" was also a secretive person like herself. The two formed an alliance, and she went undercover as the "silly daughter-in-law" in the Gu family's house. She got clues about the ledger from the confidant of her stepmother Liu's maid, and she pretended to be crazy and acted like a fool in public at the family banquet to reveal Liu's flaws. The couple cooperated internally and externally, collecting evidence, buying witnesses, and setting up business traps, step by step exposing the stepmother's crime of embezzling family property, and at the same time uncovering the truth about the murder of the biological mother in the Hou Mansion. In the end, the evildoers in both houses were eradicated, and the property and dignity that belonged to each other were regained.
