Apex domains cannot have CNAME records.
Question and response
Question
dig dakbonsa.com. NS
Answer
dakbonsa.com. 5 NS ns-166.awsdns-20.com.
dakbonsa.com. 5 NS ns-895.awsdns-47.net.
dakbonsa.com. 5 NS ns-324.awsdns-40.com.
dakbonsa.com. 5 NS ns-1521.awsdns-62.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0