Apex domains cannot have CNAME records.
Question and response
Question
dig taifu.net.tw. NS
Answer
taifu.net.tw. 4 NS nsp1.hinet.net.
taifu.net.tw. 4 NS nsp2.hinet.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0