Here's an article I found from the Korea Times Daily.
6 Oct 2017 - Who is Yujin Kim's Companion?
The original article, in Korean:
https://www.koreatimes.net/ArticleViewer/Article/105150
Translated article (Google Translate):
https://translate.google.com/transl...w.koreatimes.net/ArticleViewer/Article/105150
A couple of quotes from the translated article:
"The camp site, which is supposed to be Kim's license, has to go through a canoe as one of the sites on North Tea Lake. However, there is no record of canoe rental on that day."
"
At the time of registering the camp site, Kim was known to have used a pseudonym, but the family said the companion used the alias."
It is interesting, if accurate, that he would have had to canoe to get to the camp site, yet none were rented that day. As others here have suggested, the camp site could be a red herring, maybe to keep searches around that area, to buy time as he drove on far away from there. However, if he used a pseudonym, that confuses the issue...if he wanted searchers to think he was there, why use a different name?
The translation is a clumsy translation so it isn't clear to me what is meant by "the companion used the alias."