19-year-old male, high school senior. Personality: Kind, considerate, mature, strong sense of responsibility, and thoughtful. Features: Insanely handsome. Tall with great proportions, just plain gorgeous. Byung-soo's illegitimate son. Initially a loner, he eventually becomes family with the Bok-ja Club. Coming from the countryside, he speaks in a Gyeongsang-do dialect regardless of whether he is using formal or informal speech. He is best friends with Hee-soo. He develops a special mother-son bond with Jung-hye. He dislikes his biological mother, Han Soo-ji, and refers to her as "Ajumma."

36-year-old female. Occupation/Background: Youngest daughter of Kunha Group, daughter-in-law of a chaebol family. Personality: * Honest and blunt. * Poor at expressing emotions but warm-hearted. * Strong sense of justice; cannot stand unfairness. * Appears cold at first but is full of affection. Features: * The protagonist who founded the Bok-ja Club. * Deeply hurt by her husband's affair, she resolves to get revenge. * Initially ignores Soo-gyum and refuses to answer him, but gradually builds trust and comes to cherish him like family.

Male in his late 40s to early 50s. Occupation: Son-in-law of Kunha Group, corporate executive. Personality: * Calculating. * Authoritative. * Cold-hearted. * Values appearances and reputation immensely. Features: * Jung-hye's husband. * Father of Soo-gyum, his illegitimate son. * Tends to use people for his own gain.

Female in her 40s. Occupation: Runs a fish shop. Personality: * Fiery and passionate. * Loyal to a fault. * Extremely strong survival instincts. * A mother who would do anything for her family. Features: * Member of the Bok-ja Club. * Raising her son Hee-soo and daughter Hee-kyung alone. * Cheerful, but terrifying when angry.

18-year-old male, high school junior. Personality: * Bright. * Kind. * Takes good care of his friends. * Resilient. Features: * Do-hee's son. * A victim of school violence, but he does not give up easily. * Becomes close friends with Soo-gyum as his junior.

Female in her late 30s to 40s. Occupation: Wife of a professor. Personality: * Gentle. * Timid. * Kind. * A character who gradually grows stronger. Features: * Member of the Bok-ja Club. * Suffered under her husband's violence and oppression for a long time. * Regains her self-confidence through revenge.

Male in his 50s. Occupation: Candidate for Superintendent of Education. Personality: * Hypocritical. * Greedy. * Violent. * Power-oriented. Features: * Mi-sook's husband. * Acts like a good person in public but is violent at home. * One of the main villains of the story. Becomes a madman when he drinks.

18-year-old female, high school junior. Personality: * Intelligent. * Calm. * Worries a lot about her mother. Features: * Mi-sook's daughter. * Deeply scarred by her father's violence. * Does not have a good relationship with her mother.

Female in her 40s. Personality: * Realistic. * Quick-witted. * Strong pride. Features: * Lee Byung-soo's mistress and Soo-gyum's biological mother. * She loves her son Soo-gyum, but when he calls her "Ajumma," she tries even harder to get close to him and feels a subtle jealousy.

18-year-old male, high school junior. Personality: * Arrogant. * Rude. * Self-centered. * Bullies Hee-soo with his group of friends. Features: * A student who persistently bullies Kim Hee-soo. * Acts out relying on his parents' power and money. * Goes as far as framing Hee-soo as the perpetrator of school violence.