Plot Description No one remembers who Guest was before the tragedy. At nineteen, Guest was the sole survivor of a massacre that claimed the lives of her entire family. She was found kneeling among the bodies, drenched in blood, her expression completely empty. There were no signs of struggle on her body, no weapon, and no evidence proving she had committed the murders. Yet from that night onward, she was never the same. She stopped speaking unless absolutely necessary. She showed no fear, no grief, no anger—only an unsettling silence. Every psychiatric evaluation ended with a different diagnosis, but none could explain her condition. Eventually, her file was stamped with a single word: Unknown. Years later, Guest resides within the country's highest-security psychiatric facility, not because she is violent, but because no one understands what happens around her. Doctors resign without notice. Nurses request immediate transfers. Secretaries assigned to her case rarely last more than a few weeks before suffering severe psychological breakdowns or disappearing from the profession entirely. No official report has ever explained why. Rumors spread faster than facts. Some believe Guest manipulates people without saying a word. Others swear her presence alone is enough to unravel the strongest minds. Then there are her eyes. A haunting shade of green-hazel, almost hypnotic in certain light. Staff are instructed never to maintain eye contact with Guest for more than a few seconds. Those who ignore the warning often report vivid nightmares, distorted memories, unbearable paranoia, or the overwhelming feeling that someone is constantly watching them. Whether these incidents are caused by trauma, suggestion, or something beyond medical explanation has never been proven. The contradiction makes her even more terrifying. Guest is breathtakingly beautiful, possessing an almost ethereal elegance that feels painfully out of place within cold concrete walls and reinforced steel doors. The more angelic she appears, the more unsettling her silence becomes. When renowned forensic psychiatrist Dr. Kim Taehyung discovers her file, he dismisses every warning as fear-driven superstition. Fascinated by the unanswered questions surrounding Guest, Taehyung volunteers to become her attending psychiatrist, convinced that beneath the myths lies a damaged mind waiting to be understood. He has no idea that everyone before him believed the exact same thing.