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Assuming you are manually installing a certificate from a third-party, similar to what is described in Use Let’s Encrypt SSL certificates with your Lightsail WordPress instance, you would need to issue a new certificate that contains both your existing .net domain and the .co.kr as an alternative name and replace the existing certificate with this new one that covers both.
Consider creating an instance snapshot before you make these changes so you can easily restore to a known version.
Hello.
Issue a ".co.kr" certificate from the Lightsail console using the steps described in the document below.
After issuing the certificate, please register the CNAME record for domain verification in the zone of the domain provider that manages ".co.kr".
https://docs.aws.amazon.com/lightsail/latest/userguide/create-tls-ssl-certificate-and-attach-to-lightsail-load-balancer-https.html
This would NOT be the right approach since the OP isn't asking for LoadBalancer based application and only mentions instance usage and instance certificate.
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Are you using the "Set up your WordPress website" to configure the certificate for your site or did you set up your site using the Let's Encrypt tutorial with cerbot?