I have found that links to the usual KBA site https://m.baduk.or.kr/ from here are broken for some time now. So I checked with
https://downforeveryoneorjustme.com/, and sure enough, it was:
“It's not just you! m.baduk.or.kr is down.”
Looks like they have a new site. Fortunately, for many broken links, there is a simple fix that keeps the old ID number. So copy-pasting the new site URL over the old fixed many KBA broken links all over the site. A responsible website admin would make sure that old links redirect to new ones, to avoid broken links galore on other sites linking to it (and presumably boosting SEO ranking).
Although https://m.baduk.or.kr/ is down,
https://baduk.or.kr/ works perfectly fine. In my mind, the "m" prefix in "m.baduk.or.kr" indicates a version of the site for mobiles, but these days it is possible to create webpages with a responsive design that renders well for both desktops and mobiles, so mobile-specific sites are increasingly becoming redundant. Of course, I agree that they could have done better by redirecting URLs under "m.baduk.or.kr" to the new home.
For some reason, I am not able to do a exact string search on SL using "m.baduk.or.kr", so I have no idea whether a URL that used to use "m.baduk.or.kr" can be mapped to "baduk.or.kr" or something else. Additionally I don't understand any Korean so I don't know how to navigate the KBA site.
It wasn't just a matter of changing m.baduk to baduk. There were a few other code changes needed, but at least the article number remained the same:
https://m.baduk.or.kr/news/B01_view.asp?news_no=XXXX
→
https://www.baduk.or.kr/news/report_view.asp?news_no=XXXX
https://m.baduk.or.kr/record/gisa_info.asp?PRPL_CODE=YYYYYYY
→
https://www.baduk.or.kr/record/player_view.asp?pkey=YYYYYYY