After Jong-Du serves 3 three years in prison for a hit-and-run accident he returns home, but finds that his family has moved without telling him. Jong-Du is a social misfit and also mildly retarded. He finds himself in trouble again after being unable to pay for a restaurant bill. At the police station his brother picks him up and his family eventually takes him back in, but reluctantly.
One day, Jong-Du decides to visit the victim's family from the hit-and-run accident. The son is moving out of the house and leaving behind his sister Gong-Ju, who has cerebral palsy. The neighbors are to watch over her while the son collects her disability checks. The family kicks Jong-Du out of their home, but Jong-Du already has taken an interest in Gong-Ju.