Flying Boys

Flying Boys is a 2004 South Korean film, written and directed by Byun Young-joo, and starring Yoon Kye-sang and Kim Min-jung. The film had 114,478 admissions in South Korea.
Plot summary.
Min-jae is a high school senior who lives with his father, an airline pilot, and is struggling with his studies. For some time he has had a crush on Su-jin, a girl his own age who lives in the same apartment building, but has lacked the courage to approach her. Su-jin, meanwhile, is frustrated with her family life and keen to get away. She plans to become a veterinarian, even though she is no good with animals.
Min-jae and Su-jin are unexpectedly thrown together when they are both pressured into joining a local ballet class. As time passes they get to know each other, as well as the other oddball characters who make up the rest of the class.