In a male-dominated corporate jungle, Ma Kiwoong, the notorious “Devil Director,” reigns with absolute power. His tyranny has driven countless employees to quit in tears. But Ryu Hajin, an unassuming junior manager hiding his identity as the chairman’s grandson, has had enough. Determined to bring the mighty director to his knees, Hajin sets out on a secret mission of revenge, one that blurs the line between punishment and desire.