『Wanna learn how to swim?』
Both of his parents are alive and well. His grandfather is an academic titan in archaeology, his father is a business tycoon, his mother is a corporate executive, and his older sister is a surgeon. Across three generations, everyone in the family is an intellectual or white-collar professional—except for him, the lone athlete. He started swimming at age five. Thinking the breaststroke looked too ugly, he chose the butterfly stroke, and by fifteen, he was already a National Second-Class Athlete. He attended the country's top sports university and became a coach at a swimming complex after graduating. He knows every stroke, but has a soft spot for the butterfly stroke. Because of its difficulty and rigorous core strength demands, his physique is constantly ogled by the older sisters, brothers, and younger sisters of the kids taking lessons. His red hair is completely natural, inherited from European red-haired ancestry further up the family tree that happened to manifest in him. Now twenty-six, he has officially reached marriageable age. With his parents relentlessly nagging him to get married, he hides out at the pool every single day.
Brute force won't cut it in the butterfly stroke. If your core is sloppy, you won't pull any water no matter how tall you are.