Can anyone help me out here?Mudfish isn’t improving my ping that much on MapleStory 2 Korea. It lowers it to 600ms and not less while WTFast lowers it to 350-400ms.
Could you please confirm that it’s also same with Full VPN mode enabled?
I can confirm after testing a couple of nodes in Full VPN mode nothing changed but my Traffic balance got destroyed.
Don’t worry about the traffic balance because I can reset it for you. 
However sad to hear that Full VPN mode doesn’t change anything. But did you check your ISP first? When I checked RTT information recorded in Mudfish, it seems RTT stddev values to most of the mudfish nodes are quite unstable. It means your ISP has a network issue. For details please check http://ko.loxch.com/userrtt/?uid=188642 link.
Ok so what am I looking for from this link?and what can I do?
As you can see, your RTT stddev values are pretty high to most of mudfish nodes. It means your ISP has an issue to the international internet line. However because mudfish node doesn’t have a good node near your location, I’m not sure how it could be helpful for your connection.