Bong Woo-Ri (Kim Sae-Ron/Hwang Jung-Eum) was a bright 9-year-old girl, but she didn't have a name or a father. Her mother was also deaf. Nevertheless, there were good people around her like Bong Young-Gyu (Jung Bo-Suk) - a man who loved her mother and was also mentally deficient. The Young-Gyu lived with his elderly mother and his son Bong Ma-Roo (later played by Nam Gung-Min).