I'm the Villainess, So I'm Taming the Final Boss

Aileen Lauren Dautriche's life is turned upside down when her engagement to Crown Prince Cedric is called off for Lilia Rainworth, triggering memories of her past life as a villainess from an otome game. Aileen was reincarnated in this game, destined to die in the final act, but she can change her fate by winning over the game's final boss, Claude Jeanne Elmir, the "Demon King" and Cedric's half-brother. Claude is initially wary of Aileen's intentions, forcing her to rely on building trust by assisting him in achieving his goal of peace between humans and demonic beasts. This unlikely alliance may be Aileen's only chance to alter her predetermined demise.