In December 2006, there were changes in the lineup; Ji Hoo was removed from the group and replaced by Jung Yoonhak and Kim Jinchul (Jinon of F.Cuz).
In December 2006, Kim Jinchul was removed from the group and replaced by an older trainee, Yoon Sungmo.
Supernova released their debut album The Beautiful Stardust on September 25, 2007, with title track "Hit".
Among the members, only GeonIl, Kwang Soo and JiHyuk, together with T-ara's SoYeon, Hyomin, EunJung and Jiyeon were involved in this project.
Even though the rest of the members (from both groups) did not have active parts in the remix version, all 12 participated in the song promotions from October onwards.
Supernova made their Japanese debut in September 2009 with three singles released over three consecutive weeks: "Kimi dake o Zutto", "Hikari", and "Superstar (Reborn)".
The single's b-side "Ai Uta" (愛唄) is a cover of Japanese hip-hop group, GReeeeN's song of the same name.
Supernova's first mini-album Time to Shine was released on August 17 and the music video for the title track was "On Days That I Missed You".
Leader Yoonhak made himself busy by preparing for his Japanese drama, Love Kimchi, which was broadcast for NHK's 70th Anniversary.
[11] A sub-unit, Funky Galaxy debuted on Oct 28, 2015, composed of the rappers, Kwangsu, Jihyuk and Geonil.
[12] The leading song from the group's debut self-titled extended play, "Jesus", featured Avu-chan from the Japanese band Queen Bee.
[20] The film later named Guest House was released both in Japan on December 23, 2017, and Korea on Feb 22, 2018.
[23] After becoming free agents, the members with the exception of Sungmo (who has signed with a different agency) opened a new office SV ENT.
He was cast in the upcoming SBS TV Saturday primetime drama Fates and Furies, which is produced by the same company.
[30] In 2021, Kwangsoo (one of the three rappers of Supernova and member of subunit Funky Galaxy), was accused of having an extramarital affair with Shinohara Ryoko, a famous Japanese singer and actress who at that time was married to fellow actor Masachika Ichimura, which led to their divorce and the loss of custody of her two children to her ex-husband (since her alleged affair with Kwangsoo would have motivated their turbulent divorce).