Having grown up in the same household, Shin Chaon and Moon Sehan were once inseparable. However, everything changes after the two reach adulthood. Between attending college classes, Sehan is busy learning the violent ways of a gang boss like his father. Meanwhile, Chaon has been occupied with his own “extracurricular activities” in hotel rooms to satisfy his inner masochist. But unbeknownst to Chaon, his childhood friend is fully aware of his dirty little secret and he’s had enough. It’s time Sehan stops hiding his sadistic desire to break Chaon and bring him under his complete control...