THERE IS NO GP HACK/GLITCH! This guy is an NX whore. Either he's nexon upper employee, or he has a lot of extra cash... Guarantee he is Platinum NX Grade
All of his guns are NX, and i've seen him open cases so many times while playing CA, the dude gets 90 day & Perm guns out the ass, and SELLS them BACK.
Selling NX Rare 90 day guns and perms is 90,000gp+ EACH