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The current message from trying to log in:
"For the better quality of service, Netmarble is changing its server location to North America.
Brand-new, rapid Netmarble service is awaiting you.
Thank you in advance for your patience and cooperation."
Much of the game isn't terribly sensitive to lag, but this might make combat function better. I'm guessing that the servers were previously in South Korea, since that's where Netmarble is.