Kim Je Hyuk, a famous baseball player, is convicted after using excessive force while chasing a man trying to sexually assault his sister. Shockingly to him and the rest of the nation, he is sentenced to a year in prison. There he meets his childhood friend and fellow baseball player, Lee Joon Ho, who gave up on baseball after a car accident, but now is a prison guard and one of Je Hyuk's biggest fans. The drama revolves around Je Hyuk's time in prison, as well as prisoners he meets and events that take place there.