it is not just ripple, there are more altcoins there with highest volume. and when the volume is ridiculously high that means they possibly have 0 fees and also are reporting fake volumes.
something similar to all the Chinese bitcoin exchanges last year before PBoC started putting them under observation. now you can see their volumes are back to normal levels.
the same will be true about Korean exchanges someday too. they will either scam and run away or become regulated and they put a stop to their fake volumes.
You are wrong. Nothing fake about Korean exchanges. Korea is a country of investors be it stocks appartments. Crypto is mainstream investing news in Korea. The reason Ripple looks big in Korea is they add coins with the biggest volume which was true of ripple 6months ago bit has fallen in favour and marketcap now but is still one of only a few major coins on their major exchanges. Koreans dont really know why they are investing in these coins they just are told its a way to make.money thats all.