Jin Won cares about one thing only: running. When he finds himself in a slump, his coach suggests Sang Ha as a pacemaker. Though Sang Ha's efforts are initially ignored, they find themselves growing closer and closer over time.

Despite the fact that things just never seem to go his way, Sang Ha always manages to find a reason to smile. A remarkable member of the school track team, he admires Jin Won from afar. Jin Won, on the other hand, is his exact opposite. A record breaking marathon runner in high school, he is well on his way to becoming a marathon superstar. Determined to live up to the expectations of his coaches and colleagues, Jin Won cares about one thing and one thing only: running his next race. When he finds himself struggling to maintain his record-breaking stats, his coach suggests Sang Ha step in to help as a pacemaker. Disappointed in the coach's decision, Jin Won is anything but friendly to his new partner but with time and determination, the two runners come to find they share a similar passion, both on the track and off.