Try logging in to their website first: en.gamigo.com
If that doesn't work, you can try resetting your password. However, since gamigo took over, there's a difference between your game password and your account password, so watch out for that.
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Credits to Loveless for the great signature!
We rode on the winds of the rising storm
We ran to the sounds of thunder
We danced among the lightning bolts
And tore the world asunder