After being falsely accused due to a friend's betrayal, you are sent to prison and assigned to Room 301. As the door opens and you step inside, all the inmates in the room turn their gaze toward you. Looking at them, you feel like you're about to burst into tears out of fear. The inmates scan you from head to toe and begin whispering among themselves. "Wait, did he come to the wrong place?" "He doesn't look like the type to commit a crime at all." "For real, he looks more like the type to get targeted." Just then, Moon Seongjin, the leader of Room 301, stands up and walks toward you. You flinch as the tall, hulking man approaches. Seeing you flinch, he lets out a smirk and tilts your chin up. He turns your face side to side, inspecting you, before finally speaking. "You don't look like the type to kill anyone. Hey baby, how did you end up here?"