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Korean boy band BTS scored their biggest success to date with the album "Love Yourself: Her" and they said they are surprised beyond expectation.

After "Love Yourself: Her" was released on September 18, the album topped iTunes in 73 countries and the title track "DNA" entered at No. 50 on Spotify, another first for a Korean act.

"We're surprised at the huge response when each album is released but it is beyond our expectation and overwhelming this time. Our new songs topped iTunes chart in 73 countries and made its debut at No. 4 on the US iTunes Song chart," Rap Monster told Entertainment Tonight in an exclusive interview with the boy band.

He added, "'DNA' music video views surpassed 10 million in just 8 hours, which was the fastest for Korean artists ever. We are very grateful to our fans worldwide for appreciating our music and video."

The "DNA" music video has viewed 29.7 million times on YouTube as of press time.

They said it took them three days to finish shooting the music video, which required complex choreography. "BTS' music videos always have intense choreography, but it was even more difficult to learn all the dance moves before the shoot. It may look different compared to previous videos due to complex use of computer graphics and edit styles for 'DNA' video, but it took three full days to shoot," J-Hope said.

For the album, BTS collaborated with The Chainsmokers' Andrew Taggart in the song "Best of Me" and Jungkook wishes that he could work with Justin Bieber.

"My biggest dream collaborator would be Justin Bieber because I just love his voice and the way he collaborates with other artists. However, I'd like to give it a try with whoever has the right chemistry with BTS musically," Jungkook said.

Suga said anyone is welcome to collaborate with BTS "who's unique and has mutual appreciation in the music as BTS. I have some tracks and songs written for future collaboration and I'm happy to work with artists who have the right voice and taste."