It tells the story of Ruoyi, a college student played by Song Yiren, who accidentally falls into a complicated murder case in order to complete her graduation project. After experiencing layers of unsolved mysteries and intricate bizarre events in the "last room" of a hotel, she finally discovers the "truth" and falls into danger... Female corpse! Female ghost? Dust-covered vengeful spirits... When the girl disregards taboos and steps into the last room of the hotel, the vengeful spirits startle and murderous intent strikes! The ghost in the mirror is erratic, the female corpse hidden in the secret room exudes soul-stirring coolness, the beautiful proprietress reveals an elusive and strange affection, the unconscious man speaks vaguely, the blood-stained damaged diary, the incomplete dark yellow old photos, the shrill screams... When the last room is slowly opened, the extreme horror makes everyone shudder!