Jung-Ho, tormented by relentless bullying, reaches a breaking point, only to have his prayers answered by the archdevil Mephistopheles. Offered magical abilities to avenge his tormentors, Jung-Ho strikes a deal by trading his soul, seeing it as a better alternative to his ongoing suffering. Unbeknownst to him, he becomes entangled in a complex web of celestial and infernal powers, manipulated as a mere pawn in the intricate maneuvers orchestrated by angels, demons, and exorcists.