The customer support can change the email for you at any time but will do so only if you can be identified as the account creator.
To do so, you will have to contact the customer support using the ticket system through this FAQ while answering all questions in the ticket form.
Please provide the following information:
Username: (Account ID)
Registered Email: (You can provide us with a list of possible emails if you are uncertain)
New email: (That the account will be registered on, make sure it was never used with Webzen/gPotato before.)
If you ever entered such real life data in the account, you can have the account verified by providing a fitting copy of an ID card.
First/Last name:
Date of Birth:
Postal Address:
Game: (games you played from us)
Character/Level/Class:
Server:
First login/account creation date:
Last login:
Last 3 payment methods used:
Last 3 items bought Wcoin: