When psychiatrist Chi Cheng is assigned to a new patient-Wei Suo Wei, a quiet man found after a suicide attempt-he expects another case of trauma and delusion. But Wei remembers things he shouldn't. Details of Chi's home. His words. His scars. Even the lullaby Chi once sang to a lover who died years ago. Each session draws them closer-too close. The sterile walls of the Elysian Institute begin to twist with whispers, mirrors start reflecting unfamiliar versions of Chi, and reality fractures like glass under pressure. As obsession blurs with love, Chi must confront the truth buried inside Room 19: Who is the real doctor? Who is the real patient? And what if the only cure... is remembering the sin they shared? A psychological BL thriller where love becomes delusion, and memories are the most dangerous ghosts of all.