Hello. This is Klaytn API Service team. 

Please refer to the following information about deleting an account and a key at the same time. 

In KAS, there is an account that sends transactions to Klaytn and an account key that secures the

account. These two are kept separately. Therefore, if you want to delete the key, you have to do it

separately. The reason why the account deletion function and key deletion function exist separately is

as follows: To enhance the security of your account, you can update it as a MultiSig account. By doing

so, your account keys for your account would be also used in another account simultaneously. (If you

would like to know more about Multi-Sig, please refer to Klaytn Docs for further details.) Therefore,

if you delete your account and your account keys at the same time, it is possible that you have deleted

the keys associated with other accounts, even if it was not intended. To prevent this kind of issue, we

keep your account and account keys separately. Therefore, deleting an account will not impact a key.

If you would like to delete your keys, please delete them separately.

For any additional questions, you may also select Inquiry Registration above the KAS Help Center page

where you can register your inquiry. 

Thank you.

Klaytn API Service team.