Trapped in a men's prison under an identity that is anything but her own, Haesoo has only one goal: revenge. But surviving behind bars means more than keeping her secret. As she forms unexpected bonds with seven fellow inmates, the drive that once consumed her begins to blur. Now, with lives other than her own hanging in the balance, Haesoo must choose between avenging betrayal, and the people she's grown to care about. The deeper her feelings grow, the harder it becomes to stay focused-and the more dangerous the truth becomes.