University student 'K' finds herself magically transported into her beloved novel "The Obsessive Tyrant", where she takes on the role of Lady Cha Seon Chaek, the only daughter of the Chief State Minister. She had dreamed of being a quiet observer, simply witnessing the romantic tale between Prince Gyeong Seong and Cho Eun Ae unfold. However, during the night of the Dahong Club's meeting, an unexpected turn occurs. When she awakens the following day, she discovers she's lying next to Prince Gyeong Seong!

By chance, Seon Chaek meets Bun and ends up spending the night at his place. The next day, Bun wishes to rush to arrange a wedding with Seon Chaek, but Seon Chaek has no intention of marrying him. She begins plotting clever ways to escape the situation. Will Seon Chaek's plans succeed? Meanwhile, she finds herself threatened by thugs in the woods. That's when a mysterious man suddenly appears to help her.

To set her story back on course, Seon Chaek orchestrates a gathering to unite the intense Lord Lee Bun with his intended match. But her elaborate scheme hilariously backfires, only fanning the flames of his dangerous obsession with her instead. Now, she's trapped in a new chapter she never meant to write.