Yoon Bo-ra (born January 30, 1990), most often credited as Bora, is a South Korean idol singer, rapper, emcee, and actress. She is best known as a member of the South Korean girl group Sistar and their sub-unit Sistar19.On October 17, 2011 it was revealed that Bora will be part of the new season of television show Invincible Youth. The first episode of ‘Invincible Youth 2′ aired on November 11th.On October 3, 2012 Bora appeared in Lee Seok Hun's new music video for "Because I Like You". On the October 21, 2012 episode of the live music show Inkigayo, it was revealed that Bora would join one of four groups that would perform a new song for the SBS Gayo Daejeon music spectacular. As part of Mystic White, Bora released the charity song "Mermaid Princess" on December 26, 2012.The group would go on to perform the song in a one off performance during the year end SBS Gayo Daejeon show.