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.
By chance, Seon Chaek meets Beon and ends up spending the night at his place. The next day, Beon wishes to rush to arrange a wedding with Seon Chaek, but Seon Chaek has no intention of marrying him.
Beon shocks everyone in the Astral Philosophy Club by announcing that he's going to marry Seon Chaek.To make matters worse,Beon goes to Seon Chaek's family and claims that she took his innocence and that is the reason they must get married
Yi Beon's desperate rescue of Seon Chaek should bring them closer, but a new mystery tears them apart. When the kidnapper's body appears in public, Seon Chaek confronts a horrifying truth about the man she loves.
Resolved to bet her fate on Yi Beon, Seon Chaek bravely enters the treacherous royal bride selection. Just as she commits to her path, Su Gyeom reels from the shocking news that Eun Ae is also a candidate.
While sharing a moment of affection with Lee Beon, Seon Chaek is caught by her father and is promptly grounded. Meanwhile, the King grows suspicious of Lee Gyu's sudden return to Hanyang.
