Prison Guard Zero

Ji-hun, an elite operative from a covert South Korean special forces unit, returns home after years abroad only to face a devastating truth—his younger sister Ji-yun has been murdered, and her boyfriend, Seo Min-jun, stands accused. Though grief-stricken, Ji-hun refuses to believe Min-jun is guilty. He soon discovers Min-jun was framed and had infiltrated Yeokseon Prison to find the real killer. Tragically, Min-jun also dies behind bars. Fueled by the need for justice, Ji-hun takes on the role of a prison guard, entering Yeokseon’s brutal confines to expose the dark secrets that claimed two lives.