Raised as brothers in an orphanage, Bawoo and Joseph take opposite paths—Joseph becoming a priest and Bawoo becoming an underground fighting champion. However, when Joseph awakens as the great demon Lucifer and massacres the residents of their orphanage, their brotherly relationship turns into one fueled by revenge. In order to bring Joseph to justice, Bawoo sets off on a relentless pursuit of him and his cult. As threats mount and doubts creep in, can Bawoo's powerful fists and allies overcome Joseph's overwhelming supernatural powers and influence? (Source: Webtoon Entertainment)