Choi Mun-hyeok, a reformed criminal, is fiercely protective of his younger siblings, and will stop at nothing to keep them safe. After suffering a crushing defeat in an underground fight club, he is sold off to Seo Yeonjin, a man who cares little for the concept of family. In exchange for ensuring his loved ones' security, Mun-hyeok agrees to become Yeonjin's obedient servant, both in the office and in the bedroom. However, the latter has more sinister intentions, planning to outrage his billionaire father by embarking on a perverse, sexual relationship with Mun-hyeok. As passion and mania blur into one another, Mun-hyeok and Yeonjin's turbulent interactions could lead to an unexpected outcome...
