Jin, a feisty 6-year-old, lives with her mother and chubby little sister, Bin, in a cramped apartment in Seoul City, South Korea. When their mother decides to go look for their estranged father, Jin and Bin are forced to stay with their alcoholic Big Aunt in a small town for the summer. The girls are given a piggy bank with a promise from their mother that she will return when it is full. What at first seems like an annoying departure becomes a dire situation for the girls when Big Aunt loses her house. After their mother fails to return, Jin and her sister are forced to move to a farm owned by their grandparents. It is through this journey of abandonment that Jin comes to learn the importance of family bonds. Inspired by her grandmother's determination and hard work, Jin learns that taking care of her sister is actually a way of filling the missing link in her heart