Be careful when reading sources like that.  Just like every other financial news source, they try to attribute price swings to various economic events--I can't tell you how many times I've read stuff like "stocks rally after jobs numbers improve" or some such.  Two events might not be related at all, but they use this slick language that would make you think they are.

I never heard of this exchange, nor do I think an exchange hack could cause the kind of drop we're in the midst of.  Lots of exchanges have been hacked and the effects are variable--definitely not reliably correlated.  And I'm sure South Korea is a fairly big bitcoin market, but I don't think it's enormous.  Meh.  I'll keep an eye on the news, and thanks for posting this.