Twice
On October 7, 2015 the group's official website was created and their first extended play (EP), 'The Story Begins', would be released with the single "'Like Ooh-Ahh'" which was released on October 20. On the same day as their EP's release the group performed all tracks at a live performance. The music video was watched 50 million times on YouTube within five months of it's release and became one of the most-viewed debut music videos of any K-pop group. The group performed "Like Ooh-Ahh" at SBS Gayo Daejeon at the end of 2015.