Tongki is the son of legendary dodgeball player Na Taepung, and he transfers to Taedong Elementary School, his father's alma mater, to become a great player following in his father's footsteps. However, his classmate Mina is cold, and Kwon Chungtan, the vice-captain of the dodgeball club, constantly harasses him. With the help of his friends Mina and Maengtae, Tongki plays a super game that ends when he collapses, and barely manages to join the dodgeball club, without losing courage despite the difficulties. One day, Tongki meets Tiger, the captain of the dodgeball club of Sang-a Elementary School, the national champions, and realizes he is his true rival, deciding to compete against him. When Maengtae, busy with selecting starters, gets injured and has to withdraw, Tongki replaces him as a starter. Tongki injures his hand during practice for the match against Sang-a Elementary School, but with the help of the team members, he engages in a fiery showdown with Tiger from Sang-a Elementary School, and the match ends in a draw.