Apex domains cannot have CNAME records.
Question and response
Question
dig mirae.com. NS
Answer
mirae.com. 4 NS ns.mirae.com.
Authority
The response has no authority records.
Additional
ns.mirae.com. 4 A 203.251.24.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0