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