The amazing thing is that DFO hasn't technically launched yet in North America, which should push this number far higher. What's a few million between gamers? The 2.5D game -- which is a crossbreed of a side-scroller beat-em-up and an RPG -- has grown by leaps and bounds in the NA beta, as Nexon has adjusted the level curve and added new content in preparation for the June launch.
Nexon had a few other impressive numbers to sling about as well. Up to this point, players have killed more than 1.6 billion monsters, invaded over 25 million dungeons and engaged in PvP arena combat over 28 million times. Does this make DFO one of the world's most populated games? If you want to see the evidence for yourself, head over to DFO's site, sign up for the beta (there's no wipe going from beta to launch) and add to their hefty statistics.