

On 10 October, Sistar performed on the show Teen Superstar in Thailand. On 14 September, Sistar was invited to perform in Japan's "Hallyu Music Festival" as the only Korean girl group present.

The video went viral on the internet and was featured on G4's online show Attack of the Show!, and an RTL Television news segment. Several minutes later, Bora returned to stage along with the other members to finish filming their performance. This prompted the other members to stop singing and assist her off the stage with the help of staff. During the middle of their performance, member Bora suddenly fell onstage, fracturing her thumb. The group received a lot of media attention when a fan-taken video was uploaded online showing the group filming their performance at "Let's Start Sharing Concert" on 28 August. The music video featured Super Junior member Kim Heechul. The group returned with their second single " Shady Girl" on 25 August. Sistar had their debut performance on 4 June on Music Bank and continued promotions on various Korean music shows through 26 July.

They made their official debut with the song " Push Push" on 3 June 2010. Sistar began their group activities early in 2010 with commercials and magazine photoshoots. History 2010–2012: Debut, finding success with So Cool, Alone and Loving U
