Jing Jili lost his parents in a plane crash. He had to return to the small county where he grew up to continue school, where he met a group of people who loved playing badminton.
Zhuan Zilin grew up in his small, broken county. He didn't have many close friends, but his only good friend went abroad with his family when he was a child. He also promised that Zhuan Zilin would come back to see him in the future. He was practicing badminton while waiting for his beloved little friend.
(Any similarity is purely coincidental) Jing Ji left the attack, and Zhuan Zilin suffered.
Mission: Perseverance will lead to victory