Having grown up in the same household, Sin Cha-On and Mun Se-Han were once inseparable. However, everything changes after the two reach adulthood. Between attending college classes, Se-Han is busy learning the violent ways of a gang boss like his father. Meanwhile, Cha-On has been occupied with his own “extracurricular activities” in hotel rooms to satisfy his inner masochist. But unbeknownst to Cha-On, his childhood friend is fully aware of his dirty little secret and he’s had enough. It’s time Se-Han stops hiding his sadistic desire to break Cha-On and bring him under his complete control... 
 
(Source: Tappytoon, edited) 
Note: Includes five extra chapters.

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