The Reason Why Raeliana Ended up at the Duke’s Mansion

From Tapytoons:
Poisoned to death by her own betrothed? Eunha didn't wake up in a novel's story just to get killed off again as an unfortunate extra! Eunha decides to take fate into her own hands and ends up agreeing to spend 6 months pretending to be the fake fiancee of the novel's male protagonist, Duke Noah Wynknight. But will this cold-hearted, angel-faced demon of a man really help her avoid another ill-fated ending?

Original Novel:
Audio Novel, KakaoPage, Naver Series

Official Translations:
English, Japanese