Cho-won is an autistic but happy young man who loves to draw zebras and run. His mother wants him to feel normal by accomplishing a feat that no one thought his son could achieve. With the help of a coach in exile, she trains him to become a marathon runner.

Cho Seung-woo
as Yoon Cho-won

Kim Mi-sook
as Kyung-sook

Lee Ki-young
as Coach Son Jung-wook

Baek Sung-hyun
as Yoon Jung-won

Ahn Nae-sang
as Hee-geun

Jo Young-kwan
as Young Cho-won

Kim Min-ki
as Young Jung-won

Kim Sun-jae
as Teacher

Tak Yong-shin
as Principal

Jeon Su-ji
as Se-Yeon