TL;DR: These current forums were opened in September 2016. Before that we had a different forum system for several years. The old forums contain much history and many useful threads and posts. The old forums were closed to public access at the end of January 2017, but we're told Nexon has kept them for internal reference.
I respectfully request that public access (read-only, of course) be restored. All content in those forums was generated by users or for users, so there should be nothing company-confidential about them.