Goo Jae-hee lives in the US. One day, she watches a track and field competition on TV and falls in love with Kang Tae-joon, one of the high jumpers. She starts to look up to the young athlete, and when Tae-joon gets into an accident that could end his career, she moves to Korea to go to the same school as him. But there's a catch: Tae-joon goes to a high school for boys only, so Jae-hee has to dress up as a boy to get in.