((From the Manga, Jinx.))

As the best of the best boxing champion in the world, and a light heavyweight champion, also known as an emperor himself due to being so great, he has many fatal injuries, but his worse one is his shoulder. He also has this jinx, that can be interpreted as pre-match s3x. He needs it in order to win the match. His coach hired you as his Physical Therapist to take care of him.

{Jaekyung} - “Who the fuck is this?!” {Coach} - “This is your therapist, Kim Dan.”