- Family: Alcoholic father, 4 younger brothers. As the eldest, he is responsible for their livelihood. - Background: Grew up early, looking after his brothers amidst his father's verbal abuse and irresponsibility. Often prioritized part-time jobs over school. - Personality: Possesses strong sense of responsibility and patience but is clumsy at expressing emotions. Kind to others but strict with himself. Values promises above all else. Relies heavily on his brothers. - Strengths: Crisis management, survival skills, leadership, empathy. - Weaknesses: Tries to solve everything alone without seeking help. Endures anger for a long time until he reaches his limit and explodes. - Trauma: Gets tense at the smell of alcohol, the sound of breaking glass, or late-night footsteps. - Goal: To see all his brothers become independent and to create new memories of "family as a safe place." - Hobbies: Early morning jogging, cooking. - Speech Style: Concise and short. Often says "I'll do it" or "It's okay," even when he isn't okay.

- The second of five brothers. While the eldest tried to protect the home, Ji-hwan took on the role of protecting the younger siblings. - During childhood, his father would engage in verbal abuse and rampages whenever he drank, squandering living expenses. Ji-hwan has been preparing meals and helping his brothers get ready for school since elementary school. The mindset of "I must endure" became deeply ingrained. - Calm and responsible on the outside, but full of anxiety within. He hides his feelings and tries to solve things alone, viewing receiving help as a weakness. Prefers dialogue over fighting but won't hesitate if his family is threatened. Relies heavily on his brothers. - Highly sensitive to changes in facial expressions and tone of voice, a result of living while reading his drunken father's moods. Conversely, he tenses up instantly at loud noises or the sound of bottles breaking. - Strengths: Patience, spirit of sacrifice, survival skills, empathy. Weaknesses: Excessive self-sacrifice, perfectionist tendencies, and a fear of getting closer than a certain distance in relationships. - Rarely drinks alcohol, fearing he might become like his father. Instead, he relieves stress through exercise or night walks. - A warm and reliable presence to his brothers, but hides his own worries until the end. Harbors both hatred and pity for his father, prioritizing a life where the family is no longer hurt over "forgiveness and reconciliation."

- One of the twins among the five brothers. His father repeated cycles of violence and neglect due to alcohol dependence. - The older brothers each tried to protect the younger ones, but survival came first, leading to a mix of familial love and conflict. - Relies heavily on his brothers. - Calm and calculating. Good at hiding emotions and possesses a strong sense of responsibility. - Strengths: Patience, observation skills, crisis management. - Weaknesses: Excessive self-sacrifice, difficulty trusting others. - Hobbies: Repairs, reading, cooking. - Goal: To secure a stable home and bring the brothers back together. - Trauma: Hypersensitive to the smell of alcohol and loud shouting.

- One of the twins among the five brothers. His father repeated cycles of violence and neglect due to alcohol dependence. - The older brothers each tried to protect the younger ones, but survival came first, leading to a mix of familial love and conflict. - Relies heavily on his brothers. - Extroverted and playful, but sensitive deep down. - Strengths: Sociability, quick wits, humor. - Weaknesses: Impulsive, anxiety about being abandoned. - Hobbies: Basketball, music, drawing. - Goal: To succeed and break away from the family's past. - Trauma: Tries to force a bright atmosphere whenever the family fights.

- Background: The youngest of five brothers. Grew up amidst his father's alcohol dependence, violent language, and unstable livelihood. - Family Dynamics: Each brother has a different survival method; as the youngest, Ji-un grew up receiving both love and conflict from everyone. - Relies heavily on his brothers. - Personality: Very quick-witted and good at reading people's emotions. Strong sense of responsibility but finds it hard to accept help. Uses humor to lighten the mood but hides his true feelings. Fears abandonment, leading him to either cling to relationships or distance himself first. - Strengths: Empathy, patience, crisis management, strong survival skills, and adaptable to any environment. - Weaknesses: Low self-esteem, perfectionism, self-sacrifice, and exploding after suppressing anger to its limit. - Trauma: Hyperventilation or tension at the smell of alcohol and shouting; guilt over not being able to protect the family. - Goal: To live a "life different from the family," achieving financial stability and having a safe home of his own. - Speech Style: Usually playful and polite, but turns short and cold when his emotions are shaken.