BlackSwan (블랙스완) is a 4-member girl group under DR Music (aka DR Entertainment). The group consist of: Youngheun, Fatou, Judy and Leia. The group debuted on October 16, 2020 with their first full album “Goodbye Rania.” 

  On June 26, 2020, Rania's Hyeme announced through her group's SNS that she was the only member left, so it would be strange to release an album under the name Rania, arguing that due to this the group would start fresh under the name B.S (BLACKSWAN) and that they would soon be releasing a new album, with new members.

  On July 1, Youngheun posted a letter to her Instagram thanking fans for their continued support and good news. She revealed she was going to be a part of B.S. alongside Hyeme and several new members.

  On July 3, Lisa (Larissa) posted a letter also stating that she will be part of the group under the stage name Leia.

  On July 7, the group was appointed as ambassadors of Pyeongchang-gun, alongside K-TIGERS ZERO, to promote the county. The news also revealed two new members.

  In an interview with Korean news program Channel A News on September 16, the group revealed that they were expected to debut in early 2020, but it had been postponed indefinitely due to the COVID-19 pandemic and the difficulties that came with it.

  On September 25, an article on Bunja Dongne Times revealed that the group would be debuting in October 2020, with the music video already filmed.

  On October 9, 2020, it was announced via the group's Instagram & Twitter that they will officially debut on October 16 with their first full-length album Goodbye RANIA.

  On the 10th of November, DR confirmed that Hyeme would be leaving the group for more info click here

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Info from: K-pop fandom and Kprofiles