A modern-day auditor opens her eyes to find herself a merchant's daughter, forced into the marquis's household to bring good luck to her groom. The groom is "unconscious," her dowry is full of fakes, and the entire household is waiting for her to make a fool of herself. Instead, she turns the tables and exposes the household's cooked books: she audits the kitchens, inspects the estates, takes on the salt trade, and tears apart the money shops, using her abacus to balance every last shortfall. Along the way, she draws up a simple contract: their marriage is a business partnership, and neither of them is allowed to fall in love. Until one night, she blows out the lamp and calmly says to the ceiling beam, "Had enough of watching?" The supposedly "gravely ill" young heir drops down from the beam, grinning like a cat that's stolen a fish. On the day their contract expires, the entire capital waits to see them divorce. Instead, in front of the whole family, he eats the divorce papers.
