This article is a time-travel article and a Danmei article. Those who don't know what BL is are entering by mistake.
The male protagonist was a tennis player in his previous life. His father was Japanese and his mother was Chinese. He grew up in Japan, but due to physical limitations he could no longer play tennis, and finally died of a serious illness - the cause: Guillain-Barré syndrome.
The body after time travel has exactly the same experience as the male protagonist in the previous life. After the male protagonist traveled through time, his body was already 15 years old.
The male protagonist is familiar with the plot of Tennis King and is proficient in tennis but cannot hold a racket.
PS. The sports scene is incompetent, so this article is a gossip under the guise of tennis.