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Min Woohyung, who is very insecure about his body, decides to enroll in a men-only gym. He believes that he will get the same muscular physique the trainers have if he follows the "special program". So he tries to get used to training his hole...

Ma Ki-woong, who holds the position of general manager of the Black Namcho Company, is famous for his bad temper enough to be called the 'Chief of Demon King'. Yoo Ha-jin, who worked at the company while hiding his identity as the chairman's grandson, decides to take revenge on Ma Ki-woong in every way.