Account Book of Machiavellian Concubines: the Concubine's Wife

A concubine who had been imprisoned for seven years and had frostbitten hands, married into the Duke's palace on behalf of her sister-in-law. However, she used a secret account book as a blade to calculate people's hearts and subvert the family status. Finally, at the peak of her power, she vindicated herself and her late mother, turning all those who bullied her into debts in her account book.