Jung Seo-yeon is a woman who has lived a life of abuse and despair, trapped in a violent marriage with her sociopathic husband. When she stumbles upon a cache of illicit cash totaling 9.9 billion won (approximately $8.5 million USD), she seizes it as her sole ticket to freedom and a new life. Her life becomes violently intertwined with Kang Tae-woo, a disgraced former detective searching for the truth behind his younger brother's mysterious death. As Seo-yeon tries to keep her newfound wealth hidden from dangerous underworld figures, her former abusers, and ruthless corporate elites, Tae-woo closes in on the secrets connecting them all. The two must navigate a treacherous web of betrayal, greed, and murder where trust is a luxury no one can afford.