Jin is a bright young girl who lives with her mother and younger sister, Bin. She does well in school but is sometimes distracted from her family duties and occasionally wets the bed. One day she comes home to discover people removing the furniture from the family apartment. Her mother takes her and Bin to stay with "Big Aunt", their paternal aunt, who lives outside the city. The girls' mother leaves them a piggy bank and tells them that their aunt will give them change for their good behavior, and when it is full she will come back.