When their parents move to the countryside, Daeyoung and his older brother Daesu join them. There, they meet Sunghyeon and Gangjin, the sons of their father's friend. Daeyoung, the youngest, often feels like an outsider compared to the older boys, despite their relatively small age gap. One day, curious about what the older brothers are doing, Daeyoung secretly follows them to Sunghyeon's house, hoping to join in their activities. However, this unexpected visit reveals a side of Sunghyeon that Daeyoung had never seen before.