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.

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, , , , South Korea is full of X-like laws. I will start taking revenge from now on the results of those X-like laws, the 'law enforcement boys' who pushed me into hell and didn't get punished.