Yunseong Lee is a victim of school bullying and decides to take revenge on school bullies by becoming a juvenile offender. After he enters a juvenile detention center, he meets a couple of guys who bullied him at school and executes his plan accordingly. However, there is one person who is yet to be avenged. Against these products of a failed judicial system, Yunseong's path of revenge begins. This series contains strong themes and graphic depictions of violence, sexual harassment, and self-harm, suitable only for mature audiences. Viewer discretion is advised.