So that means at least three South Korean exchanges have been hacked this year, at least those who made it public. I cannot remember the first one in March, but Bithumb recently was discovered last month (although the hack started all the way in April) and now Youbit. It must be of little coincidence that all these hacks started around the same time. Perhaps more exchanges are affected but do not know it yet? I'd change all my passwords if I'm using a South Korean exchange now.