Man-ho is a pacemaker for Korean national marathon team. His purpose is to stay ahead of others until the 30km mark. But he gradually grows a desire to run for the victory.
Yoon-jae moves to a new high school and starts hanging out with Se-joon, a mysterious student. Needing money for his sickly mother, Yoon-jae accepts a job offer by Se-joon. However, he doesn't exactly know what it is.
A boy who is forced to eat a spider while being bullied by his friends in childhood has super powers and becomes a hero "gummy-man."