A verified Nexon account is an account that passes the security check via Korean cellphone. The only reasonably-legitimate way for an outsider to get through that, is to have a Korean friend make/verify the account. The entry isn’t similar to account registration here. You could buy one, but account buying discussion is forum-taboo.
If you still want an account registration Guide, I can edit this post with instructions. But why not just run a VPN for this version? The only thing you’d have to stay aware of, is that you will need to turn off the VPN when adding funds to your Steam wallet and buying TP for ToS (Steam does not approve of people changing their location to potentially take advantage of regional discounts).