I Became the Tyrant Duke's Terminally Ill Fake Fiancée

Synopsis

"Six months. I'll purify your blood curse, so just become my shield until I die." Reborn as Seira, an abused illegitimate noblewoman cursed to die in six months, she realizes her tragic fate in a dark fantasy novel. Refusing to perish quietly, she strikes an audacious fake engagement contract with the empire's most terrifying tyrant, Grand Duke Kilian.