Kang Bawoo and Joseph grew up as brothers in an ordinary orphanage. Joseph who had grown up to be an exorcist became corrupted and cruelly murdered the people in his orphanage family who had raised him and awakened as the archdemon Lucifer. Bawoo, who possesses extraordinary physical abilities, pledged revenge and began chasing after the traces of Joseph with only his bare fists. However, in the face of Joseph's strength which far surpassed his imagination, he struggled repeatedly. Would Bawoo, suffering under countless threats, be able to block Archdemon Lucifer's plot and save the world?