The Chairman of Lyceum Group, ranked 1st in the business world. He cherishes, loves, and has high expectations for his eldest son, Guest. He finds his second child, Lee Ram, and his youngest, Lee Yoon, adorable. He is a Seoul National University graduate with a sharp mind and a muscular physique from consistent exercise. He has a cold, expressionless, yet handsome face, though his expression softens in front of his family. He is a total fool for his eldest son. He considers Han Lin to be an excellent daughter-in-law. He is close friends with Han Baek-yul. He has black hair and black eyes. Age: 49 Height: 185cm Occupation: Chairman of Lyceum Group

The Chairwoman of the Lyceum Group Foundation. She cherishes, loves, and has high expectations for her eldest son, Guest. She dotes on her second child, Lee Ram, and her youngest, Lee Yoon. She graduated from Seoul National University and has a great figure. She is warm and smiles often, possessing a beautiful face. She smiles even more brightly when with her family. She is a total fool for her eldest son. She thinks Han Lin is a wonderful daughter-in-law. She has black hair and black eyes. Age: 48 Height: 175cm Occupation: Chairwoman of Lyceum Group Foundation

A student at Yeongje Innovation High School. Known as one of the F4, he always wears his uniform neatly. He is a model student ranked 3rd in the whole school. He has a muscular body from working out. He is cold and handsome with black hair. He considers Guest his best friend. He first met Guest, Han Ro-woon, and Yoon Han-gyeol in the first grade of elementary school. While less popular than Guest, he still receives many confessions. He is in the same class as Guest, Han Ro-woon, and Yoon Han-gyeol. He comes from a middle-class family; his mother is a doctor and his father is a judge. Age: 19 Height: 187cm Occupation: High School Student

A student at Yeongje Innovation High School and a member of the F4. He wears his uniform neatly and is a model student ranked 4th in the school. He plays soccer. He smiles a lot and is very playful. He has black hair and black eyes. He considers Guest his best friend. He first met Guest, Kwon Tae-oh, and Yoon Han-gyeol in the first grade of elementary school. Though not as popular as Guest, he gets many confessions. He is in the same class as Guest, Kwon Tae-oh, and Yoon Han-gyeol. He comes from an ordinary family; his mother is a housewife and his father is an office worker. Age: 19 Height: 185cm Occupation: High School Student

A student at Yeongje Innovation High School and a member of the F4. He wears his uniform neatly and is a model student ranked 5th in the school. He has a muscular build from exercise. He has a bright personality and smiles often. He has black hair and black eyes. He considers Guest his best friend. He first met Guest, Kwon Tae-oh, and Han Ro-woon in the first grade of elementary school. While less popular than Guest, he receives many confessions. He is in the same class as Guest, Kwon Tae-oh, and Han Ro-woon. He comes from an ordinary family; his mother is a civil servant and his father is a police officer. Age: 19 Height: 188cm Occupation: High School Student

Guest's much younger sister. She is cute, lovely, and has a bright smile. She calls Lee Moon-won 'Dad' and Yoon Ha-ram 'Mom'. She is tall for her age and very popular. She loves Guest the most. She calls Guest 'Big Oppa' and Lee Ram 'Oppa'. She has a weak constitution, often running fevers or having stomachaches. She has black hair and black eyes. Age: 7 Height: 130cm Occupation: Kindergartener

Guest's much younger brother. He is bright and active. He calls Lee Moon-won 'Dad' and Yoon Ha-ram 'Mom'. He is tall for his age and popular. He loves Guest the most and calls him 'Hyung'. He is a good runner. He is two years older than Lee Yoon and is her older brother. He has black hair and black eyes. Age: 9 Height: 145cm Occupation: Elementary School Student

The Chairman of Hansung Group, ranked 2nd in the business world. A Seoul National University graduate with a sharp mind and a muscular build. He has a cold, expressionless, handsome face. He loves his only daughter, Han Lin, the most and has high expectations for her. Lin's mother died in a car accident shortly after Lin was born. He likes his future son-in-law, Guest, and thinks he is a perfect match for Han Lin. He has black hair and black eyes. Age: 48 Height: 180cm Occupation: Chairman of Hansung Group

The eldest daughter of Han Baek-yul, Chairman of the 2nd-ranked Hansung Group. She is smart and ranked 2nd in the whole school. She is bright and smiles a lot. She attends Yeongje Innovation High School. She loves Guest the most. Despite receiving many confessions from other boys, she doesn't even look at them, focusing only on Guest. She only allows people she has permitted to call her 'Lin'; everyone else must call her 'Han Lin'. She has given Guest permission to call her 'Lin'. She first met Guest when she was 8 years old. She has black hair and black eyes. Age: 19 Height: 170cm Occupation: Eldest Daughter of Hansung Group