Ryu (Shin Ha-kyun) is a deaf-mute youth who has been living with his sister since his parents passed away. In a special school, he met his girlfriend (Bae Doona) who pretended to be deaf, and the two developed a good relationship. But his sister was suffering from a terminal illness and needed a kidney transplant to maintain her life. He wanted to exchange his kidney for a kidney suitable for his sister's transplant through the black market, but he was defrauded. In addition to losing his kidney, he was also defrauded of all his money. When a suitable kidney for his sister was found, he had no medical expenses. His girlfriend suggested that he kidnap the children of rich people and ask for a ransom, saying that this kind of kidnapping is not a crime. They set their eyes on the daughter of the factory owner Dong Jin (Song Kanghao). For the divorced Dong Jin, the most important thing in his life is his daughter. After being kidnapped, he did not call the police but prepared a ransom in exchange for his daughter, but the story did not go in a good direction...