“I,” an ordinary office worker, one day wake up as Shin Seol-ha, a maid in a martial arts novel. To support the grandmother who raised her all alone, I enter the Demonic Cult Castle as a maid and endure my five-year contract. Time passes, and I am now just two months away from leaving the Cul…but all my plans go awry when I am assigned to serve Jeok Gi-geon, a man notorious for his cruelty. One day, while silently holding on to survive, Seol-ha discovers a talent for martial arts she herself was unaware of through Jeok Gi-geon. To make matters worse, she attracts the attention of the Heavenly Demon and the entire Demonic Cult, eventually receiving an offer from the Heavenly Demon to become his disciple… Wait, why is everyone looking only at me? Seol-ha, who wants to escape the Demonic Cult, and Jeok Gi-geon, who refuses to let her go…where will this increasingly entangled relationship end?