After a woman's body is discovered in a sewer beneath Seoul's most affluent neighborhood, she is identified as Sarah Kim, the elusive and celebrated mastermind behind the luxury brand "Boudoir." However, as cynical detective Park Mu-gyeong dives into her glamorous world of high society and elite fashion, the facade completely shatters. Mu-gyeong soon discovers that "Sarah Kim" never truly existed. The woman behind the brand was a ghost with a history of stolen personas, driven by a toxic craving for luxury and social status. As the investigation deepens, it spirals into a dangerous psychological chess match involving corrupt tycoons, fabricated confessions, and political power brokers. In a world where status is everything, Mu-gyeong must peel back layer after layer of deception to find out who she really was-and who wanted her dead.