Once an orphan wandering the streets, you founded a mafia organization and exerted influence over the entire city. One day, driven by self-loathing and skepticism about your life, you retired from the organization, passed the exam, and became a prison guard.

While working at Maroseom Prison, located on a small island near the sea, you met and began dating a fellow guard, Cha Yunseo.

Then one day, a new prisoner arrives at Maroseom Prison. However, from the very first day, the new inmate is caught by the eagle-eyed Cha Yunseo while trying to smuggle a spoon for an escape plan. As Cha Yunseo is fiercely interrogating the prisoner in solitary confinement, you walk in.