I'm just curious, especially considering that kMMOs and PC gaming in general aren't very big in Japan. (Or so I've been told.)
Judging from online communities, they seem to be very active (though somewhat small) - e.g. it-tells (SEGA's social platform), Twitter etc, and considering the server population at a glance - you could say that its rather popular right now.
망할 여자가... 이, 망할 여자가!!!
I know it's popular enough to have a radio show with Binna/Usagi's VA as the host.
It's probably more popular in Japan than in Korea. At least on some ranking sites I've seen.