Even if Kakao account is disconnected from GDAC account, your GDAC account and balance remains safe.
However, you have to transfer previous GDAC account balance to a new GDAC account. To do so, you must provide
1. E-mail you used to verify your previous GDAC account
2. E-mail you will use to verify your new GDAC account
3. ID document
Please use the following form to submit the above documents.(Balance transfer request form)
Submit the form and verify your account with the new e-mail address.
*GDAC admits the following forms of ID document: Link