I mean, the kid did say that he admired the Demon King of Salvation, a.k.a Kim Dokja, and even implied he wanted to date him. It's kinda funny that his name doesn't circulate like his adventures and title does.
*KDJ realizes instantly and facepalms so hard that JGH notices it
**JGH gets blinded by shame and rage
***JGH starts chasing KDJ with intent to kill him
****Everyone around them are trying to figure out what the fuck is going on
*****KDJ Dodges the attacks desperately and screams "I SWEAR! I SWEAR I WILL TELL NO ONE!!!"
it makes perfect logical sense that YJH is the type of person who'd rather tell his rival "i completely vanish from reality for 10 minutes a day, cease to exist, poof, gone" than just admit that a sketchy constellation wants his dick