I still recommend you read the above thread as it does shed some light on whether vpns/tunneling services are actually a viable choice in regards to lowering your ping.
However, the reason provided to me by this kind redditor was that:
"In WA the internet route from WA to all of SEA including KR was cut on the 25th of janurary http://en.wikipedia.org/wiki/File:SEA-ME-WE-3-Route.png and is expected to be fixed "soon" it may improve your ping to KR when it is fixed if you would like to keep updated on it check out http://www.iinet.net.au/status/fault.php?id=2295154"
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