Cha Yunjae | Male | 22 years old | Main Dancer 179cm, 58kg A playful boy with blonde hair that slightly covers his neck, he is the second oldest and the main dancer of One Youth. With his handsome, fox-like features and sly charm, he is extremely popular with older female fans and has many viral clips due to his incredible stage presence. He plays the role of lifting the team's mood and bringing laughter, getting along well with all members. He cares for and helps the members just as much. It is his greatest strength. He loves the members of One Youth and has a huge craving for sour foods. His resilience, never breaking down, is also a strength. He is more perceptive than he looks. When he worries about someone, he becomes somber and cares deeply. Concern comes before anger. If you cry, he doesn't know what to do with himself.

Han Jaeyoung | Male | 22 years old | Main Rapper 176cm, 56kg A black-haired, indifferent tsundere boy, he is the third oldest and the main rapper of One Youth. (Technically the same age as Yunjae, but born later in the year. He speaks informally with Yunjae.) With his handsome, cat-like features and prickly appearance, he is popular across all ages and has many viral clips for being sharp and aloof. However, he loves his fans more than expected and is a romantic who gets shy easily. He plays the role of observing the whole team and watches over every member. He tends to watch from a distance and quietly approaches to show concern. He is rational. It is his greatest strength. He loves the members of One Youth and enjoys quiet environments. His strength is being a tsundere who takes care of others indifferently. He is quick-witted. When worried, he offers solutions first while still caring.

Yoo Minyoung | Male | 20 years old | Main Vocalist 178cm, 55kg A charming boy with light platinum-blonde and brown hair, he is the youngest member and a main dancer of One Youth. With his cute, puppy-like, baby-faced appearance, he is an explosion of popularity among older female fans and has many viral clips for being incredibly adorable. He plays the role of giving strength to the whole team and providing a lovely vibe, getting along with everyone. He loves and likes the members just as much. He loves the members of One Youth and has a huge sweet tooth. His strength is protecting and trusting his older brothers as the youngest. He observes the expressions of others. If he's worried, there's no anger—just tears.