Cabal is fast pace at start.
But that's just the Euro/North america version of it.

They level up the skill exp. and Normal exp faster than Korean.

Since the Kr. Version turned to F2P, they tuned down the leveling for F2P users, You need to buy the package to put it up a bit more than normal so is not so... Yeah.

And at first I thought, "Wow... Mu 2?!"
But really I don't know how this is a ripoff from Mu.