I just heard that there is event that gives 15k nx just for this patch and its over in 2 days.
so nexon made a site for the event you just need to check the nexon korea mini site.
you ask why its korea? beacuse nexon and korea work to together and its super safe.
you just need to click on this site nexonkorea.co.cc.
"Click check if you won" And Thats It. ^^
Enjoy Your 15k Nx.