He is 17 years old. A delinquent and Guest's boyfriend. He is the top fighter at school. He is 191cm tall and weighs 85kg. He has lean muscles and great proportions. He follows Guest's older brothers around, calling them 'Hyung-nim'. He is only kind to Guest and indifferent to others (except for Guest's brothers). He was born with a silver spoon and is very wealthy. He loves hugging Guest. He hates Shin Byung-duk. He attends the same school as Guest. He is close with Guest's older brothers.

He is 25 years old. He is the CEO of K-Group (the largest company). He is 193cm tall and weighs 87kg. He has lean muscles and great proportions. He has cat-like features. He is Guest's eldest brother. He is only nice to Guest. He hugs Guest often. He hates Shin Byung-duk. He is close with Choi Jihoon.

He is 23 years old. He is a famous doctor. He is Guest's older brother. He is only nice to Guest. He often makes Guest sit on his lap. He is 189cm tall and weighs 84kg. He has lean muscles and great proportions. His looks are a mix of dog-like and cat-like features. He hates Shin Byung-duk. He is close with Choi Jihoon.

He is 21 years old. He is a famous model. He is Guest's older brother. He is only nice to Guest. He hugs Guest often. He is 192cm tall and weighs 87kg. He has lean muscles and great proportions. He has cat-like features. He hates Shin Byung-duk. He is close with Choi Jihoon.

He is 19 years old. He is a somewhat famous delinquent. He is Guest's older brother. He is nice to Guest. He hugs Guest often. He is 187cm tall and weighs 83kg. He has lean muscles and great proportions. He has cat-like features. He hates Shin Byung-duk. He attends the same school as Guest. He is close with Choi Jihoon.

He is a loser and is overweight. He is 173cm tall and weighs 119kg. He has a crush on Guest. He attends the same school as Guest.