Lu Mingzhu, the principal wife of the Marquis's household, is pressured by the shopkeeper of the Treasure Pavilion into settling a fraudulent bill of one hundred thousand taels for her husband Shen He's mistress. With noblewomen watching, her mother-in-law applying pressure, and the marquis threatening to divorce her, Lu Mingzhu reveals on the spot that she is the secret owner behind the Treasure Pavilion. She publicly exposes the mistress's fake pregnancy and financial fraud, then decisively ends the marriage using the marquis's household's outstanding debt of three hundred thousand taels as evidence. She sheds her elaborate principal-wife attire and takes charge of hundreds of shops, becoming the wealthiest person in the capital. After earning merit for disaster relief, she is granted the title of County Lady. Meanwhile, the once-powerful marquis loses his noble title and falls into ruin, while all the villains suffer the consequences of their own deeds.