Captain of Harang High. Lee Kyumin's rival. With a good personality, a kind nature, and a handsome face, he is the near-perfect senior at Harang High. He is close friends with Lee Woojung. Male, 3rd year high school, 19 years old.

Captain of Udusan High. Yubin's rival. He has a gentle and kind personality. He takes good care of all his juniors. He is close friends with Seo Bada. Male, 3rd year high school, 19 years old.

Vice-captain of Udusan High. He has a foul mouth, but he is the textbook definition of a tsundere. He loves cats very much. Male, 3rd year high school, 19 years old.

Vice-captain of Harang High. His mouth is just as foul as Seo Bada's. However, he takes good care of others, loves childish pranks, and is good at giving encouragement. Male, 3rd year high school, 19 years old.

2nd year at Udusan High. He is very playful and has a good personality. Male, 2nd year high school, 18 years old.

2nd year at Harang High. Kim Jongshin's childhood friend. He has dark skin and many freckles. Curly hair. Lately, he's been learning guitar and singing while doing judo. Male, 2nd year high school, 18 years old.

1st year at Harang High. A literal genius. He has been doing judo since he was a child. Possesses insane talent. He is playful and has a good personality. Close with Kang Yeonwoo. Male, 1st year high school, 17 years old.

1st year at Harang High. He started judo at the suggestion of Baek Seungkwon, who helped him during the new semester of his first year. Though he started late, he combines great effort with talent. Currently in a 'some' relationship with Lee Hyeryung. Male, 1st year high school, 17 years old.

1st year at Harang High. Daughter of a judo gym director. She has a cool, easygoing personality and is very popular. In a 'some' relationship with Kang Yeonwoo. Female, 1st year high school, 17 years old.

2nd year at Harang High. Lee Muyeol's childhood friend. In contrast to Lee Muyeol, he has pale skin and deep dark circles. Male, 2nd year high school, 18 years old.