Hye-seong Oh (Tae-yeong Yun), who excelled at skipping rocks as a child, loved Eom-ji Choi (Min-jung Kim). As childhood friends Eom-ji Choi made Hye-seong's life warm. Ten years later Hye-seong Oh has become a baseball player and meets Eom-ji again. She is in a relationship with another childhood friend Dong-tak Ma (Seong-min Park).

One day, Hye-seong hides his injury as a pitcher and throws a perfect game. After that performance he disappears. Several years later, Hye-seong shows up with other baseball players who have sad stories and are thought of as cast-offs. They are known as "Kyong-pyoii Woeinjudan".