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Erkin, a young pharmacist from the north, was orphaned from the war between the Northern Nations and Mormeratta. After making a name for himself in Mormeratta, he is summoned to treat a mysterious "master of the castle" whom no one has ever seen. He reluctantly agrees, hoping it will bring him one step closer to finding the infamous Witch of the Sun who killed his parents during the war. Little does he know, on his quest for vengeance, the witch may have been by his side all along. What will Erkin do when confronted by his sworn enemy turned friend?
Seven years after leaving the Herbet Empire to escape her selfish mother, Rosena Estalot returns seeking treatment for her sick son, Illion. There, she reunites with Yerhan, the third prince of the empire and Illion's father. When Yerhan proposes marriage, Rosena, reluctant to reenter high society and confront her mother again, agrees on one condition: an eventual divorce. With Rosena so set on pushing him away, can Yerhan win her heart before their marriage runs its course?
Dullahan, the demon lord who once terrorized the world, finally revives in modern-day Korea, eager to take revenge against the hero who defeated her centuries ago. But all she can find is his descendant, Yongrae Kim: a hapless, incompetent office worker with no prospects and no joy in life. Ending his life now would only be doing him a favor, so Dullahan decides to improve his life first… but Yongrae's two-timing girlfriend and his many strict superiors at work stand in the way. Can Dullahan crush the office hierarchy and awaken Yongrae's dormant hero abilities to make her revenge more satisfying?