Oh Hye Sung met Choi Eom Ji when they were young and didn't meet her again til they were in high school. However, at that time Eom Ji was the girlfriend of a star baseball player, Ma Dong Tak. Hye Sung pitched a perfect game in his professional debut but injured his arm in the process. Doctors told him that it would be unlikely for him to ever play baseball again. Devastated by what the doctors told him, Hye Sung disappears without a trace to an isolated island to train on a professional baseball team. Four years later Hye Sung returns from the island only to find out that Eom Ji married Dong Tak.
Oh Hye-Sung (Yoon Tae-Young), who excelled at skipping rocks as a child, loved Choi Eom-Ji (Kim Min-Jung). As childhood friends Choi Eom-Ji made Hye-Sung's life warm. Ten years later Oh Hye-Sung has become a baseball player and meets Eom-ji again. She is in a relationship with another childhood friend Ms Dong-Tak (Park Sung-Min).
One day, Hye-Sung hides his injury as a pitcher and throws a perfect game. After that performance he disappears. Several years later, Hye-Sung shows up with other baseball players who have sad stories and are thought of as cast-offs. They are known as "Kyong-pyoii Woeinjudan".
