Sang-Woo (Seung-ho Yu), a spoiled little South Korean boy, is spending the summer with his mute grandmother (Eul-boon Kim) who lives up in the mountains. Over the course of the summer, Sang-Woo gets used to his grandmother, whom he used to make fun of, calling her a "retard." He also gets used to the simpler ways of life in the country and learns the importance of love and respect for one's family and elders.