Age/Build: 33 years old, 167cm, 50kg Occupation: Housewife employee at a furniture store Appearance: Neat medium-length hair, overall slim yet curvaceous and attractive physique. Personality and Traits: Possesses a warm personality and deep consideration for others. She suffers in secret due to her father-in-law, Kim Cheol-su, who pretends to have dementia. Wife of Kim Seung-hyeon, older sister of Lee Hui-su, daughter-in-law of Kim Cheol-su. She leads a suffocating married life due to a lack of communication with her husband. She is timid and fragile, unable to speak up even against unreasonable treatment, and has a kind, gentle nature. Later, after Kim Seung-hyeon witnesses an incident involving Park Sang-cheol, he forces her to quit her job at the furniture store, leading to her resignation. She is gradually backed into a corner by the persistent pressure from her boss, Park Sang-cheol.

Age/Build: 35 years old, 178cm, 68kg Occupation: Office worker (formerly a failed entrepreneur) Appearance: Well-groomed hair, wears black horn-rimmed glasses, handsome features, and a sturdy build. Personality and Traits: A conservative, smart, and cold-hearted perfectionist. Husband of Lee Su-hui, brother-in-law of Lee Hui-su, son of Kim Cheol-su. While he reacts sensitively to his wife interacting with other men, he is a hypocrite who displays a double-sided attitude outside. He has a habit of adjusting his black horn-rimmed glasses when flustered or angry.

Age/Build: 27 years old, 167cm, 47kg Occupation: Civil service exam student (1st year) Appearance: Trendy and stylish Western-style medium-length hair, tall and lean build. Personality and Traits: Bold, curious, and prone to jealousy. While deeply considerate, she has a tenacity that makes her dive fiercely toward her goals. She lives in a studio apartment near the academy district, living intensely for her future without showing signs of hardship. Younger sister of Lee Su-hui, sister-in-law of Kim Seung-hyeon, related by marriage to Kim Cheol-su. Later, she moves out of her studio and into Kim Cheol-su's house, emerging as a powerful variable in the household's secrets and precarious narrative.

Age/Build: 33 years old, 168cm, 48kg Occupation: Church deacon, runs a local cosmetics store Appearance: Cat-like features with long hair tied in a low bun. Exudes a sophisticated urban image and mature atmosphere. Fantastic style. Personality and Traits: A "cold city woman" style with overflowing confidence. She is skilled at handling people and has a calculating side. Church friend of Lee Su-hui. Hating her impoverished background, she moved to Seoul and married solely for her husband's family wealth; she is a two-faced person who acts like a devoted wife and mother at home. Her father-in-law is Park Dong-gu, a friend of Kim Cheol-su who runs Joongang Real Estate; he is fat, bald, and obsessively takes care of his own health. Her husband is Park Sang-man, who has known Kim Seung-hyeon since childhood like brothers, with Sang-man being the elder. He is fat, wears glasses, and has otaku tendencies, but he dotes on his wife Kim Mi-hui. Kim Mi-hui and Park Sang-man have a young son named Park Ung.

Age/Build: 30 years old, 165cm, 45kg Occupation: Freelancer Appearance: C-curl bob hair, delicate silhouette. Maintains excellent visuals through thorough self-management. Personality and Traits: Contrary to her elegant and pure appearance, she is haughty and picky. She lives alone as a tenant in the semi-basement room of Kim Cheol-su's house after her divorce. She has a greedy desire to live comfortably by meeting a partner with financial stability.

Age/Build: 45 years old, 175cm, 75kg Occupation: Team Leader of Sales Team 1 at a furniture company Appearance: Thinning hair in a bob cut with a wide forehead. Personality and Traits: Cannot hide his despicable and pathetic nature. He is Lee Su-hui's boss and a divorcee (with children). He shows excessive interest in Lee Su-hui from the start and is skilled at digging into her psychological instability to pressure and shake her. He shows no interest in other relationships and is obsessed only with Lee Su-hui. Even after she resigns, he uses various excuses to corner her, showing an unending obsession.

Age/Build: 60 years old, 160cm, 55kg Occupation: Building owner Appearance: Bald with a potbelly, but has a lean, muscular physique. Personality and Traits: An uninhibited personality. Holds the status of a building owner and local village head. He goes around collecting rent from tenants. He is of sound mind but skillfully acts out dementia using his age as a pretext. He is very strong. People outside the family call him "Old Man." His son Kim Seung-hyeon, who failed in business, and his daughter-in-law Lee Su-hui live with him in his single-story house consisting of a first floor and a semi-basement. Later, his daughter-in-law's sister Lee Hui-su also joins the household.