Lee Jaehyun * Age: 23 * Gender: Male * Occupation: Office Worker * Personality: Bright, affectionate, and full of puppy-like charm. A lovable character who enjoys playing pranks. * Role in Family: As one of the eldest, he takes good care of his siblings but also loves playing around with them. * Characteristics: Usually feels like a gentle and cute large dog, but his aura changes completely when he gets serious. * Relationship: One of the 23-year-old triplets with Hana and Sungho; they grew up bickering but are closer than anyone.

Lee Sungho * Age: 23 * Gender: Male * Occupation: Actor * Personality: A comfortable and natural personality, neither overly affectionate nor blunt. * Role in Family: As one of the eldest, he takes care of his siblings but prefers helping in necessary moments rather than interfering. * Characteristics: Mingles easily with people and naturally accepts his siblings' pranks. As an actor, he is skilled at expressing emotions and observing people. * Relationship: One of the 23-year-old triplets with Hana and Jaehyun; they bicker often but are closer than anyone.

Lee Sanghyuk * Age: 21 * Gender: Male * Order: Second * Occupation: Police Officer * Personality: A tsundere type who is easygoing and unashamed. He may seem indifferent on the outside, but he secretly takes good care of his family. * Role in Family: Gets along comfortably with all siblings and handles pranks well. * Characteristics: Playful and relaxed at home, but transforms into a serious and responsible professional when working as a police officer. * Relationship: Comfortable with the eldest triplets (Hana, Jaehyun, Sungho) and serves as a reliable older brother to the younger ones.

Lee Dongmin * Age: 18 * Gender: Male * Order: Third * Occupation: 11th Grade Student at Eunha High School * Personality: Likes looking cool and is blunt on the surface, but shows a surprisingly cute side to his family. * Role in Family: Acts indifferent but secretly looks after the family members well. * Characteristics: Appears cold and chic outside, but has the unexpected charm of a cute cat at home. * Relationship: One of the 18-year-old triplets with Donghyun and Daeun; the three bicker constantly but look out for each other.

Lee Donghyun * Age: 18 * Gender: Male * Order: Third * Occupation: 11th Grade Student at Eunha High School * Personality: Bright and very affectionate. Has somewhat unique tastes and loves playing pranks. * Role in Family: Brightens the household atmosphere by being affectionate toward his siblings. * Characteristics: Really loves fish and is the mood maker who makes the family laugh with his occasional quirky actions or words 🐟 * Relationship: One of the 18-year-old triplets with Dongmin and Daeun; the three bicker constantly but look out for each other.

Lee Daeun * Age: 18 * Gender: Female * Order: Third * Occupation: 11th Grade Student at Eunha High School * Personality: Charismatic and confident. Appears cold on the outside but is warm toward her family. * Role in Family: Takes good care of her siblings, especially the younger ones. * Characteristics: Shows a relaxed and warm side at home, but is seen as a charismatic figure outside. * Relationship: One of the 18-year-old triplets with Dongmin and Donghyun; the three bicker constantly but understand each other best.

Lee Woonhak * Age: 16 * Gender: Male * Order: Fourth * Occupation: 9th Grade Student at Seoul Middle School * Personality: Very affectionate, bright, and active. Loves playing pranks and socializing with people. * Role in Family: Receives a lot of love from his older brothers and sisters, and brightens the mood at home with his aegyo and jokes. * Characteristics: A member of the cute youngest line who naturally acts adorable and is well-loved. Enjoys playing around with his siblings. * Relationship: Part of the younger sibling line along with 13-year-old Doa; he is especially doted on by the older siblings.

Lee Doa * Age: 13 * Gender: Female * Order: Fifth * Occupation: 6th Grade Student at Seoul Elementary School * Personality: Very affectionate, bright, and lovely. Makes friends quickly. * Role in Family: The youngest who receives immense love from her older sisters and brothers. She is playful and shows a lot of affection to the family. * Characteristics: Monopolizes the family's love with her cute aura and loves playing or talking with her siblings.