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The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised. 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.

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