Se-ha who is physically handicapped and Dong-gu who is mentally handicapped are not their own brothers. But while living 20 years together, the two became indispensable to each other. One day, the mother of Dong-gu suddenly visits him and acts as his guardian.

When Sun-oh's abusive father dies while on duty as a firefighter, he feels a sense of liberation. As he dreams of a new life, his mother and sister seem to have forgotten the violence they endured. Confused, Sun-oh falls in with delinquent friends and starts his first relationship hoping to leave his father behind. However, at his father's memorial ceremony, Sun-oh shatters as his mother and sister speak of forgiveness.