The Project 17 : Side by Side.

Ping An is an autistic teenager who gains recognition for being a badminton prodigy. Zihao is his younger brother and a fellow badminton player. Xiao Na 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.