i heard you can get banned if you are inactive is that true o.o?

no it's not

There are some games that do this. They delete you account if you go inactive. However they only do so if your gone for more than a year.

Whether or not Wasabii does this, I'm not sure. Taiwanese DBO hasn't been here for a year yet :P

just log in once in a while with WoW ijust pay the minimum so my account and hardwork doesnt get deleted in case i return i also play it in that time

I think for the korean version mabye cause i cant play the korean verison anymore cause it give me this error all in red whenver i got ingame so yes i think there is a ban