In a small town in Busan, South Korea, a boy named Junhao lives with his mother and half-brother Chenghao. His mother is busy with work and doesn't have much time to accompany them. Junhao loves to play with his brother. The two of them eat spicy stir-fried rice cakes, go hiking, and play video games together at home... Although his family is not well-off and his biological father is indifferent, Junhao, who is optimistic and likes to take care of others, still has a childhood full of laughter. One day, Junhao received the bad news that his mother was seriously injured in a car accident. The two boys had to leave home and go to his brother's biological father. During the days of living under someone else's roof, Junhao felt the difference in treatment and a vague sense of uneasiness - his brother's biological father planned to send Junhao to an orphanage...