On the last day of his 19th year, top student Hyunsung Kim's promising future was completely destroyed. Targeted by the "Golden Circle"—a wealthy, vicious, and sociopathic group of high school bullies—Hyunsung was pushed off a roof and spent the next ten horrific years in a vegetative state, paralyzed with only his consciousness intact while watching his family fall into utter ruin and financial despair. When he suddenly wakes up, he finds he has inexplicably regressed ten years into the past—back to the very day his nightmare began. Abandoning all notions of forgiveness, justice, or moral high ground, Hyunsung vows to become the ultimate evil to eradicate evil. Utilizing his decade of stored rage, tactical intellect, and cold-blooded calculation, he steps back onto the high school battlefield as a ruthless devil, systematically taking down every single bully, corrupt authority figure, and shadow organization piece by piece.