The frozen space in a little girl's heart begins to thaw thanks to the love of her older sister in this profoundly affecting drama. Six-year-old Jin (Hee Yeon Kim) and her younger sister Bin live in a cramped apartment with their single mother. One morning, the girls are sent to live with their alcoholic aunt, where they are given a piggy bank and told that their mother will return when it's been filled. Wrestling with feelings of abandonment, Jin showers her younger sibling with affection.