Apex domains cannot have CNAME records.
Question and response
Question
dig hsing-fa-tang.com. NS
Answer
hsing-fa-tang.com. 5 NS ns1.hsing-fa-tang.com.
hsing-fa-tang.com. 5 NS ns2.hsing-fa-tang.com.
Authority
The response has no authority records.
Additional
ns1.hsing-fa-tang.com. 5 A 91.231.84.136
ns2.hsing-fa-tang.com. 5 A 91.231.84.129
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0