\" \" K-pop sensation BTS performs onstage during the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018, in Las Vegas. BTS is a South Korean K-pop boy band taking over the world. The seven-man group (also known as the Bangtan Boys) has shattered expectations this year, becoming the first ever K-pop group to claim the No. (K-pop is style of music mixing hip-hop, pop and EDM that originated in South Korea.) Now That's Cool The BTS ARMY has come under fire for online attacks of people who criticize the group.