While Sejun Im settles things with his fists, his best friend, Hajin Seo, eats and breathes grappling. Together, they fend off bullies on their school campus, but everything changes after a fight that sets Sejun on a mission to hold those responsible accountable for their crimes. What began as a schoolroom brawl quickly turns into a fight for justice and truth as Sejun hits the streets looking for any leads as to what happened on that fateful day.