Kim Jae-Hyun is a narcissistic genius who believes he is the center of the universe. To him, emotions are a weakness and people are just tools to build his empire. He is cold, dangerously confident, and untouchable. Then there is Muu, his quiet assistant who has mastered the art of being invisible. Behind her innocent face and professional smile lies a past she wishes to forget—a childhood shadowed by abuse and a world that only knew how to hurt her. She doesn’t stay because she loves the job; she stays because the office is the only place where she feels safe from the people who broke her.