A touching coming-of-age story about family is told through the eyes of an autistic teen and his younger brother. Ping An (Leon Leong) is an autistic teenager who gains recognition for being a badminton prodigy. Zihao (Zhu Zijie) is his younger brother and a fellow badminton player. Xiao Na (Yang Chaoyue) is a bright and cheery young woman who helps out at her grandpa's badminton court for the summer. She gets close to both brothers and becomes attracted to Zihao. However, their journey is not as smooth-sailing as they'd hope and the two brothers are pushed to a difficult crossroad.