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Firts your need to delete/remove those links To delete those links from search engines Go to your Search Console > Google Index > Remove URLs The main reason for that, is probably your site has been hacked and it is used as zombie website. Im pretty sure that problem is the theme or some nulled plugin this kind of problem is very usual when some get a theme of a untrusted website. So make a backup of your site, then delete everything, add a fresh version of your theme and plugins. Once your site is clean follow these tips To secure your website https://wordpress.org/plugins/all-in-one-wp-security-and-firewall/ Another security tips https://yoast.com/wordpress-security/

Thanks, Lesli, It seems that you were correct.  There seems to have been a coding error, which I fixed and implemented. After pushing the code again, I saw the changes reflected immediately like you said. Thanks for your help with this! Best, Sung

Awesome, great link, thanks!