Nationally renowned track star Na Ae-ri, famous for her undefeated streak across the country, encounters her former rival Hany—a gold medalist and the only person to ever beat her—at her new high school. The story follows their unexpected participation in 'Street Run,' a special racing competition held in city alleyways. As they compete against the skyrocketing newcomer Ju Na-bi, the stakes rise for the title of National Youth Representative. It is a high-octane sports drama about rivalry, growth, and the thrill of the race.