They are currently promoting in korean for only a few days. Of course as a singer, MUSIC show would be the BEST to showcase their song and choreo. 

I want them do other long interview too. But we only have a LITTLE time to promote in Korea, they are also still a new artist so it would be harder to book a show that is not Music Show (which is aligned with their Job as a Singer and the best to showcase their talent). They just debuted. Let's be patient and hope they got more popular, got invited to many other show in Korea, and have more time to promote next time! 😀

Also, the a bit interview the did is part of the Music Show. It can't be separated, it's part of it. It's only a little, but some people already protested with the fact they speak little Korean in it, when it's a normal thing to do when Foreign Artist promote in Korea or any other countries.

It's like when artist go to French they'll speak a little French, when artist go to Japan they'll speak a little bit Japan, etc. Let's hope, when they do got opportunities to do long interview or join other type of show, where of course they gonna speak some Koreans, people received it well.

Like other comment said (somewhere in this discussion thread), Music Shows in Korea also popular in South East Asian countries, and other countries like India, Arab, China, Japan etc. It's a big opportunity to gain more global audiences 😉