During the 5th grade elementary school summer vacation, 12-year-old Namwoo always spend a lot of time outside the home only because of the parents' quarrel. One day, when Namwoo plays in the playground, he makes a mistake and breaks his glasses. And on that day, he hears the news from his mother that his parents had already divorced. Even after the day, Namwoo still plays outside his house and suddenly, his father comes to him. Although Namwoo feels embarrassed and cautious, he could see his father change little by little. As time passes, Namwoo starts to accept the situation and understand his parents. Finally, Namwoo grows to become slightly more mature, and goes through the pain of letting his inner child go.