In Seoul, the deaf and dumb worker Ryu is very attached to his sister, who needs a transplantation of kidney. He tries to donate his own kidney to his sister, but his blood B type is not compatible with her. When Ryu is fired from Ilshin Electronics, he meets illegal dealers of organs and the criminals propose Ryu's kidney plus ten millions Won per a kidney suitable for his sister. Ryu accepts the trade, but he does not have money to pay for the surgery. His anarchist revolutionary girlfriend Cha Young-mi convinces him to kidnap Yossun, the daughter of his former employer Park, who owns Ilshin Electronics. However, a tragedy happens, generating revenge and a series of acts of violence.