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For the past couple of days, the game has been spamming the following message:
"Enjoy summer as we celebrate x2 EXP and SKILL PROFICIENCY from Apr 21, 10:00 AM ~ Apr 23, 10:00 PM GMT+9!"
That's an exact quote. They botched the start, but double experience and skill proficiency is now on.
But it's still not Summer. I don't know if whoever wrote that message is just confused, or if they mark the seasons differently in South Korea.