The Su family silk and satin shop in Pingjiang Prefecture of the Great Yong Dynasty suddenly suffers a catastrophic disaster. The paternal uncle Su Hongyuan colludes with a wealthy merchant to forge IOUs and set fires to destroy account records, usurping all the family assets of the Su family. Su Wanqing, the legitimate daughter of the Su family, falls to the lowest ebb but refuses to yield. Relying on her weaving craftsmanship, she reorganizes a small shop, making a living on one side while hunting for account books, human witnesses, and material evidence. Cooperating with the impartial prefecture judge Lu Yanzhou, she cracks heavy traps such as rivals counterfeiting and causing disruptions and hiding witnesses, clears her family's grievances with laws and solid evidence, rebuilds the mercantile house, and upholds the original intention of honest commerce.