I Refuse to Be the Marquess's Matriarch: The Concubine-Born Daughter Is Cherished by the Whole City

In a nutshell: After three years of neglect in her marriage, she decisively fakes her death and divorces him. Reclaiming her peerless beauty and intelligence, she draws a host of powerful admirers, while her ex-husband is consumed by regret and kneels to beg her to take him back, only to be rejected.