I Stole the First Night of the Trashy Crown Prince

Lovelyn Dines was reincarnated into a romance-fantasy novel. The catch? She is the villainess destined for the guillotine after having an affair with the Crown Prince, Ian.
To save her own neck, she decides to fix up the original leads and stay far away from Ian. She successfully alters the plot, but after a wild, drunken mistake... she wakes up right next to him. Terrified of meeting her original fate, she flees the scene, hoping the notoriously promiscuous prince will just forget about their one-night stand.