A 15-year-old circus ringmaster Wei-wei is left all alone with gorilla Ling-ling after grandfather passes away. Thanks to her grandfather's love for baseball, Ling-ling was trained to play baseball and has developed remarkable hitting skills. The materialistic sports agent Sung Chung-Su hears of this remarkable gorilla, and signs Ling-ling to play in the professional South Korean baseball league. Dreaming of success, World's first gorilla pinch hitter and his 15-year old trainer begin on their run in the Korean Baseball League.