Unshakable Female Lead in Regret Genre

A woman discovers she’s the heroine in a regret story, enduring abuse from the male lead’s family. With past experience in tough jobs, she handles their cruelty effortlessly. Deciding to cut ties, she vows to outshine them all. Unexpectedly, Duke Callinos offers a marriage of convenience—five billion gold yearly—to spite his own family. She embraces the role, turning troublemaking into her strength.