Possible Nexon Database Exploit?

One of my friends got hacked yesterday =/ Lost everything he had. And he didnt share his info with anyone.

His email did get hacked though, one day all of a sudden the pass to it got changed. Then rest follow suit~

My friend seems to have been affected by this too. Though, I have no idea on whether or not their email was affected, nor do I know if anything was taken. They were, however, capable of changing the password. Although I found it odd that it was their alternate account that has been affected, unlike their main account (whom they mostly play on). Whoever got on their account just... botted to level up somewhere. Strange as hell.

I wonder what the hell's going on, anyway.