The female lead, a merchant's daughter, marries into her husband's family with a generous bridal dowry. On their wedding day, the groom's family conspires to force her into a subordinate position, seize her dowry, and take a mistress. The female lead exposes the conspiracy, confronts the mistress, ends the marriage, and uncovers evidence that her husband's family is colluding with foreign enemies and manufacturing weapons. She presents evidence in court, leading all wrongdoers to be punished.