You’ve updated the authoritativeNS records at your current DNS provider, but you also need to update the nameservers set at your domain registrar. They’re currently set to:
olley.co.kr. 86400 IN NS ns-616.awsdns-13.net.
olley.co.kr. 86400 IN NS ns-245.awsdns-30.com.
According to whois, your registrar is https://www.blueweb.co.kr/. I don’t know if you registered the domain through a reseller, though.