On a more serious note: The way that YJH uses that Story in particular to keep track of Kim Dokja. That is literally THEIR story. The Kim Dokja Company has one big narrative together woven by all of their individual Stories with each other, each connecting every part of their nebula together

like one big constellation and headed by their Polaris known as the Demon King of Salvation. But [Life and Death Companions] is specifically YJH and KDJ's story together. And they share the same exact story too. Most everyone has two Stories that are interwoven but the names are different