About 900 high school seniors are enrolled in the Korea High School Baseball Association. Among those 900, less than 100 players advance into the professional league. Lim Sung is a pitcher who is in his last year as a high school baseball player. He reunites with Kim Heedo, the batter who hit a two-run homer in the bottom of the ninth inning three years ago. Heedo is about to quit the baseball team he just joined. "Why are you obsessed with me?" "Obsessed?" I didn't expect to be asked that. Lim Sung and Kim Heedo stood on the same ground for a game only once. I want to compete with Heedo again, I really want to win against him. Lim Sung's competitiveness turned into curiosity and a one-sided friendly relationship from wanting to get to know him more. "Because I want to do it with you." The straight end of Heedo's eyebrow rose slightly. Sung, who brought about a change for Heedo for the first time, barked out a laugh. A senior in high school, on the sun-drenched field. Can the boys' baseball and love become cycling hits?