In the country's most violent prison, nothing survives untouched. Not the guards. Not the rules. Not the doctor who was never supposed to be there. Dr. Dunk Natachai walks into Ratchanarok believing he's there to fix broken minds. He doesn't realize he's just stepped into the hands of the man who breaks them. Joong Archen - inmate 09, murderer, king of the underworld behind bars - runs the prison like a kingdom built from blood and silence. Every deal, every body, every scream in the dark belongs to him. And now, so does Dunk's attention. Between the sound of knives scraping metal and whispered confessions in the therapy room, something starts to twist - hunger, fear, desire. He's the doctor. Joong is the danger. But inside Ratchanarok, it's hard to tell which one's truly locked up.