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Here is the link, if you are curious.
You will need a national ID #, either your own or a friend's to play. If you find a bunch of mates who speak your language, you can start a clan there and play together if ping isn't a problem.
From what I saw in the videos, it looks like DFUW, so you won't need to worry about the foreign language tutorials if you are familiar with that game. It looks like DF1 is dead and gone.
Regarding subscriptions in Korea, you can usually buy them in increments of 7, 30, or 90 days. You can also by hour-based time cards for like 5 or 30 hours. The hour-based cards are only charged when you're online. The subs run as usual whether you log in or not.
I think their whole business plan is based on exploiting the intense rivalry between Korea and Japan to keep players interested in this game since they will be playing on the same server. If that doesn't work, this game will tank in Korea/Japan. I'm interested to see how it turns out.