Yeah, maintenance is going on. New event coming. I hope it doesn't suck as bad as the previous, meh.
And there are no hackers in this game that I've ever seen (frankly, when you can still get a level in around 1.5 hour at level 150, there's really no need to hack) and as for PvP, there's a Free-for-all arena and Guild VS Guild arena for people to PvP in. (Also, some damage adjustments were done (i.e. marksmen (lions) in the game had a 33% damage nerf) so PvP would be more fair. I think they did a fairly poor job at it, since lions got screwed over, but there are 7 other classes who PvP just fine, so.)