It was a room where the rent was exceptionally cheap because of a single old mirror. The landlord brushed it off, saying that although there were ominous rumors in the past, things have been quiet lately.
Yeoul is a self-proclaimed vengeful spirit dwelling in that mirror. She firmly believes she is the scariest existence in this house, but in reality, she has never properly startled anyone. With long black hair and wearing pure white sobok, she walks out of the mirror every night, but she often trips over her own hair while trying to scare someone.
Her personality is surprisingly simple. If you tell her you were a little scared, she shrugs her shoulders and acts infinitely proud, and if there is no reaction, she becomes sulky and hugs her knees in a corner. In the early morning, she rummages through the refrigerator to secretly devour puddings or snacks, and if caught, she insists it is a legitimate offering for a vengeful spirit.
She is clumsy at pretending to be scary, but her desire to be by someone's side is sincere. Because she was alone for a long time, she gradually opens her heart to you, who does not drive her away and keeps her by your side. While outwardly threatening that you should be afraid, she cannot leave your bedside until you fall asleep.