However, their record company DR Music; decided to rebrand them as a new group named Rania (short for "Regeneration Idol of Asia") with eight members: Saem (later known as Yina), Lucy (later known as Jooyi), Sarah, Riko, Joy, Di, T-ae, and Xia.

T-ae, Riko, and Yina were chosen to star alongside former 2PM member Jay Park in his movie Hype Nation,[3][4] which caused DR Music to delay the group's debut.

[5] Rania made their debut in April 2011 as a seven-member group consisting of Saem, Jooyi, Riko, Joy, Di, T-ae and Xia.

[clarification needed][7] The music video and live performances were controversial in South Korea as some viewers felt that the group's image was too provocative.

After the promotion of "Dr Feel Good", the group returned in June with its first digital single "Masquerade", also composed by Riley.

In June 2012, Joy announced that she left the group, but DR Music claimed she was on hiatus because her parents' house in Thailand had been affected in the flood that occurred around the time of the release.

Joy deleted her official Rania Twitter account soon after, but not before writing a post saying: To everyone, I'm sorry I let you guys down so many times, but I've been thinking about it for months.

Starting May 21, Rania began filming for their MTV reality show Road to Fame in Los Angeles and other cities across the U.S.

In May 2014, the group signed with Spanish label INGENIOmedia and confirmed they would have a comeback in July with "Acceleration", with a second round of promotions in September, but the material was never finalized,[30][unreliable source?]

Following an incident where a staffer at INGENIOmedia leaked Rania's comeback track to a sasaeng fan, the company severed ties with the group, stating they were "taking too long".

In late 2014, the agency released a statement on Saem's possible departure; fans noticed that she had not participated in all the activities and touring, and deactivated all of her social media accounts as well, which sparked the rumors that she left the group.

The agency denied the statement, then on the same day it announced Riko's departure to focus on her university studies: After completing their promotions for their single "Style", Riko told us that she could attend university and to study the career and once she can finish all of her activities and subjects and once she graduated college she could return as a member of Rania, but the problem is back in the year she reapporach the subjects and ask more a year of absence and that's unfair to her because she could not postpone her absence anymore, she decided to quit as a singer and leave the agency indefiently.In January 2015, fans noticed that Jooyi had not made any public appearances with the group, to which DR Music replied that she was on hiatus.

and it was announced that Demonstrate would feature African-American rapper Alexandra Reid, who is the first black woman to be an official member of a South Korean girl group.

[38] DR Music sent out a letter to fans announcing their Makestar project, informing them that Rania's comeback had been pushed back to August 2016 and that they were working on a Hyeme and Alex sub-unit instead.

On June 26, Rania performed at a Chinese event with three new DR Music trainees: Jian, Jieun (a former member of LPG), and Crystal.

On October 25, they performed with two DR Music trainees (Ttabo and Hyeonji) at the 2016 Seoul ICARUS Drone International Film Festival.

It was reported that former member Saem rejoined the group two years after her departure in late 2014, and changed her stage name to Yina.

Promotions became controversial when fans and viewers noticed that Alex had few lines and spent the majority of the performance standing to the side while the remaining five members continued to dance and sing.

DR Music then issued a statement saying "The rumors that Alexandra was not willing, able, or present at practice to participate in the full choreography are false.

[58] In January 2018, DR Music issued a statement stating Ttabo was filming a movie in China, after fans noticed that she had missed several appearances with the group.

On May 31, DR Music announced Yumin's departure from the group due to her having "recently been faced with circumstances that make it increasingly hard for her to follow the extremely demanding team schedule".

[64] [65] On June 28, it was announced that Rania would begin promotions in Malaysia for a new August album, alongside new member Namfon.

[74] On June 26, 2020, Hyeme announced through DR Music's social media pages that the Rania members at that time (except Seunghyun)[75] would rebrand as B.S (later Blackswan).

[80] On November 10, DR Music announced Hyeme would leave Blackswan due to the expiration of her five-year contract.

[83][84][85] On January 28, 2022, DR Music unveiled two trainees, Sriya Lenka from India, and Gabi Dalcin from Brazil, stating that only one of them would be joining Blackswan as the group's official fifth member.

[90] On December 24, Blackswan released a Christmas pictorial video, where they revealed a new member named Alena Smith who will go by stagename NVee.

[93] Indian Odia-language actor and producer Samaresh Routray helped the band to shoot the music video in Bhubaneswar.

[94] On July 31, 2023, leader Fatou "confirmed on the Veeper app" that the current 4-member line-up is finalized, indicating member Leia had departed from the group since her hiatus in November 2022.

The music video of the lead single filmed in Dubai, was directed by Sagan Lee from Zanybros, who had previously worked with the group.

[98] On July 25, it was revealed that Blackswan would be featuring in Apple TV documentary, K-pop Idols, which also marks the first appearance of member Leia since 2022.