Possible Nexon Database Exploit?

There is another possibility if you had login using the web site and using the wireless on a public (semi-public) network. As the web site login is not https, all information send/receive is not encrypted, someone can use wireless hacking tools to collect/filter information on all the wireless traffic.
Also another more remote possibility is some hacker is able to craft a "hacked" pdf/flash to install some sort of keylogger on your computer, if you have Adobe installed and haven't kept it up to date.