Confirming kMS NX clothing doesn't expire. All non-sale clothing, iirc. No "SPECIAL TIME OFFER" crap like gMS.
They also don't have pet items, but rather skills. I believe the skills are permanent too, so the cost of maintaining a pet is much, much less than in gMS.
They also don't have pet items, but rather skills. I believe the skills are permanent too, so the cost of maintaining a pet is much, much less than in gMS.

