“The First Night With the Duke” is a romance fantasy that tells the story of an ordinary college student whose soul becomes transferred into a minor character of a romance novel and spends the night with the obsessive male lead. Although Cha Sun Chaek is a minor character without a significant role in the novel, she is born from an affluent family with great status and power. Her dream is to live a quiet and comfortable life, but the story takes a 180 degree turn when the soul of college student “K” suddenly enters her body and unintentionally spends the night with the male lead. Yi Beon is a royal family member favored by the King. A cold and handsome man, Yi Beon is also skilled in martial arts. However, Yi Beon hides painful scars from his past caused by numerous odd rumors. Although he has an icy heart, he is fiercely loyal and devoted to the woman he loves.