In the suburbs of Beijing, a group of troubled teenagers are learning to play baseball under the guidance of a 70-year-old baseball coach. A boy named Ma Hu joins them and disturbs their peace. He is fond of pranks and forms cliques in the team, which makes him a thorn in others’ side. The series tell the story of a few boys: Ma Hu, Li Haixin, and Xiaoshuang, who are naughty, or lovely, or gentle and sensitive. The baseball team is required to move out within a time limit because their playfield will be demolished. But they will participate in an important junior baseball game held in the US on behalf of the Asia-Pacific region in half a year.