Green Days (2011)

Original title: 소중한 날의 꿈

Yi-Rang is a track runner in her high school. She has never lost a race and considers running to be the sole thing she is good at. One day, she falls behind in a race and purposefully falls down. Yi-Rang quits running out of fear she will lose again. Her high school can't even persuade her to try again. New transfer student from Seoul Soo-Min enters Yi-Rang class. She is pretty and attracts all the boys attention. Yi-Rang observing her charms feels even more insecure. Classmate Chul-Soo, who aspires to become an astronaut, attempts to help Yi-Rang find her way ...