First off, welcome to the forums. :)
It is closed beta, but even if it was an open Korean beta test you'd still need an account (and a KSSN).
There are ways to get a KSSN, although signing up with someone else's KSSN is identity theft (the chances of them actually going after you are slim, but it's still illegal), but even with the KSSN you need to activate the account with a Korean cell phone number (which you really can't get past).
The easiest way around it, sadly, is to wait for the english beta tests. :(
Edit : Apparently you only need to do the cell phone activation for an adult's account, follow
this guide on how to make a kid's account.