Hello, I think you might like to try this link:

 http://www.memrise.com/courses/english/?q=advanced+korean

Currently I am learning the Korean alphabet with this website (so I am a true beginner...) but I noticed that on the same website there are a lot of courses for Intermediate and Advanced korean. But they look like vocabulary building exercises- you might want to go and see for yourself. Perhaps they would be useful to you...

Also, you might like to check out  http://www.learn-korean-now.com

I think that the  site is pretty amazing and you can have a free trial and see if you like it- they offer a course for Intermediate Korean and Building your vocabulary.  

I think I have a few more resourses that might be useful to you, but I can't remember them right now. 

Anyways, all the best with your Korean learning. I am so impressed that you've reached such advanced level!! Well done and all the very best for 2015. Whenever you find some great resources please share them with the rest of us:-)