'Hashtag' interviews are always personal and entertaining, and this one is no exception! The girls seem really comfortable with each other as they joke around and laugh during their interview.

There's a surprise 'oppa' friend who they call on the phone to sing to, and you can see them perform their title track "Hurt Locker" before their music show performances.

SEE ALSO: Kim Soo Hyun confesses to mental overload 2 days after starting 'Bubble' from trying to read all the fans' messages

What are you waiting for? Click on the video above!