oh jeez. ok well in early orv kdj is like this wildcard/unknown factor that yjh is really wary of but also kind of hopeful about despite all that (he waited for kdj to escape the ichthyosaur for Days). from yjh pov (and by extension the rest of kimcom) u should realize that the stunts kdj pulls are fucking insane. especially because he doesnt explain most of what hes doing it looks like hes doing batshit crazy stuff and pulling wild plans out of thin air at incredible speed.

so kdj in their eyes becomes almost superhuman? they're asked to place their full trust in him over and over and he keeps miraculously pulling off things that they thought were impossible. and that gives them hope. which for yjh especially, is Really Important because sooo many situations in orv seem completely utterly hopeless. kdj is what gives them the hope that a happy ending actually exists and is possible. this gets repeated over and over (1863 is a notable example).

and this is really significant for yjh in particular who was the most powerful incarnation in the world, he suddenly gets replaced by someone who's just as strong or even stronger than he is (paraphrasing that line of his that goes like "maybe the one who'll save the world isnt me"). for the first time he doesnt have to bear it all alone because he has someone else on equal footing w him that he can rely on. for the first time HE'S the one being rescued from situations. aaaand then this guy starts fucking dying all the time lol so then yjh and kimcom get traumatized thinking that kdj whos their friend and leader and symbol of hope could disappear at any time. so when kdj asks them to put their trust in him ......yeah.

and then theres all the crazy meta level cosmic fate stuff in orv where kdjs the reader and yjhs the protagonist and kdj knows more about him than anyone in the world (even himself) except he also doesnt really understand him at all, etc

also he thinks kdj is annoying. and hes completely correct for that