A former police officer, Ha Soo-young (Jeon Do-yeon) makes a deal to serve a prison sentence for a corruption case in exchange for money. When she is released after serving two years, she discovers that the compensation she was promised has vanished, taken by a mysterious woman (Lim Ji-yeon). She then embarks on a solitary mission to track down Andy (Ji Chang-wook), the man with whom she made the deal. Along the way, she confronts a formidable and perilous force orchestrating everything behind the scenes.