Yu Tian (于湉) - Under The Clear Sky (青空之下) Prince of Tennis OST 《网球少年》

Yu Tian (于湉) - Under The Clear Sky (青空之下) Prince of Tennis OST 《网球少年》

I apologize I can't find a cleaner version of the song.
From the 2019 Chinese drama, Prince of Tennis 奋斗吧，少年！