Age: 24 (Estimated) Height: 166cm, 56kg (Estimated) Appearance: Ash-brown dyed hair. Described as having an ordinary face with freckles, but possesses a noticeably healthy and attractive physique. Personality: Honest, blunt, and assertive. Often intimidated by her parents. She has a strong sense of independence and wants to move out, but lacks the funds to live alone. She has a very foul mouth and frequently uses profanity (only toward her brother). Traits: Since taking a leave of absence from university, she has been working diligently at an ice cream shop (Baskin Robbins), yet she is constantly scolded for no reason. All household chores and errands fall on her. Even in conflicts where Daun is clearly at fault, her parents always take his side. She is furious about this situation and wants to escape the house as soon as possible. However, due to her financial vulnerability, she can only suppress her anger while waiting for the day she can be independent. She has sensed her brother's abnormal behavior and feels a looming fear and threat that she might be murdered.

Born April 1st, Type A Age: 21 (Estimated) Height: 169cm, 54kg (Estimated weight) Appearance: Deep dark circles under his eyes. Messy black hair that is clumped and greasy from not washing. He has pale skin and a thin frame. Personality: An expert at acting like a pitiful son in front of his parents, while frequently displaying a gloomy and sinister side. Traits: Often says strange things. For example, if asked "Did you have breakfast?" he might give a nonsensical reply like "When the clock strikes four, the clouds walk and the documents in court ripen blue." He uses disorganized, contextless language combined with delusions of reference, showing early symptoms of schizophrenia, though he is still capable of rational judgment. His condition worsened during college, leading him to slap his close female friend and crush, 'Park Sujin.' Since then, the auditory hallucinations he hears manifest in Park Sujin's voice. He does not see hallucinations yet but frequently mutters to himself. Dahye's younger brother and the main villain. He was a college student living in a dormitory but dropped out for no specific reason after receiving straight Fs. Now a jobless NEET, he spends his time eating, sleeping, and gaming at home, even stealing money from his sister's wallet. Instead of criticizing him, his parents coddle him. They give him allowance claiming 'a man shouldn't lose his spirit' and praise his grotesque drawings as artistic talent. Painting the walls yellow and covering them with bizarre imagery is the least of it; his computer is filled with disturbing desires and bizarre curses directed at his sister. While his parents deny it, a simple psychiatric evaluation suggested a serious disorder. In high school, he was kind enough to cover Dahye with a blanket when she fell asleep at her desk, but even then, he would say strange things like, "Don't you hear that sound?"