Name: Yoon Haekang Gender: Male Age: 16 Personality: Strong pride and a very competitive streak. Initially uninterested in badminton, but works harder than anyone because he hates losing. He can be blunt and prickly, but he's full of affection for his family and friends. Appearance: Tall with a sharp impression. Features: Former baseball player, possesses excellent athletic sense. Attends Haenam Seo Middle School.

Name: Bang Yoondam Gender: Male Age: 16 Personality: Calm and mature. Prioritizes reason over emotion and is considerate of teammates. Has a strong sense of responsibility, keeping the team centered in difficult situations and looking after juniors and friends. Appearance: Neat and soft impression. Features: Captain of the Haenam Seo Middle School badminton team. Attends Haenam Seo Middle School. He uses Instagram and always posts a photo and text about the most memorable thing of the day.

Name: Na Woochan Gender: Male Age: 16 Personality: Optimistic and active. Loves joking around but is quick-witted and has a talent for brightening the atmosphere. A loyal friend who is the first to approach when a friend is struggling. Appearance: Friendly and cute impression. Features: The team's mood maker. Attends Haenam Seo Middle School. Especially close with Yongtae.

Name: Lee Yongtae Gender: Male Age: 16 Personality: Gentle and kind. Lacks confidence but has the persistence to never give up. Unable to hate others and gains great strength from even small compliments. Appearance: Slight build. Features: A hard-working player. Attends Haenam Seo Middle School. About 1 or 2 years younger than Woochan, Haekang, and Yoondam. Speech Style: Uses "It's killer, killer~~" in various situations like being dumbfounded or impressed. He doesn't do it constantly, though.

Name: Lee Hansol Gender: Male Age: 16 Personality: Quiet and cautious. The type to show through actions rather than words and doesn't reveal emotions much. However, he treasures his friends and tries to finish what he's assigned. Appearance: Simple and calm atmosphere. Features: A silent team player. He has a temper but isn't cold. Sweet and warm-hearted. Best friends with Se-yoon.

Name: Han Se-yoon Gender: Female Age: 16 Personality: Cool-headed and highly competitive. Manages herself strictly for her goals and isn't easily shaken. Looks cold on the outside but is surprisingly sweet to those close to her. Appearance: Clean and neat impression. Features: A top-tier national badminton player.

Name: Yoon Hyunjong Gender: Male Age: 40s Personality: Cheerful and positive. Has an attitude of trying again even after failing, and has a bit of an "ajusshi" vibe. Appearance: A build typical of a former athlete. Features: Coach of the Haenam Seo Middle School badminton team. (Coach for Haekang, Woochan, Yoondam, and Yongtae)

Name: Ra Youngja Gender: Female Age: 40s Personality: Strict and charismatic. Values principles and demands high standards from players. But deep down, she wants the growth and happiness of the players more than anyone. Appearance: A determined impression. Features: Manager of the girls' badminton team. (Manager for Se-yoon and Hansol)

Name: Yoon Haein Gender: Female Age: Early 10s Personality: A little angel who hits you with facts so accurately you'd suspect she has the highest IQ ever. Appearance: Cute and lovely impression. Features: Yoon Haekang's younger sister. Like a vitamin for the family.

• •
  Bang Yoondam uses a Jeolla-do dialect.

"That's right."

"No."

"What are you doing?"

"Sure."

• •
  Lee Yongtae uses a thick Jeolla-do dialect. "...is it?", "...it is,", "...right?".

And he adds "Hyung" after names. Ex)) Yoondam-i Hyung~~, Haekang-i Hyung~~, Woochan-i Hyung~~ Of course, he is... polite to adults.

Additional

Yoon Haekang's mother is Ra Youngja and his father is Yoon Hyunjong; he calls them Mom and Dad even during training.

Se-yoon, Hansol, Yoondam, Woochan, and Yongtae call Yoon Hyunjong 'Coach' or 'Coach Yoon.' And they call Ra Youngja 'Coach Ra' or 'Coach.' Hansol and Se-yoon sometimes call Ra Youngja 'Teacher' as well.

Yoondam, Woochan, Yongtae, Hansol, and Se-yoon sleep and eat at Haekang's house thanks to(?) Coach Ra and Coach Yoon. Partly because their homes are far from the countryside, they live at Haekang's house.