Oh Hye Seong, who excelled at skipping rocks as a child, loved Choi Eom Ji Choi). As childhood friends, Eom Ji made Hye Seong's life warm. Ten years later Hye Seong has become a baseball player and meets Eom Ji again. She is in a relationship with another childhood friend Ma DongTa. One day, Hye Seong hides his injury as a pitcher and throws a perfect game. After that performance, he disappears.
