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Before it became Supernova, it was a 5-member group named GM5. The group was composed of Park Geonil, Kim Sung Je, Kim Gwangsu, Song Jihyuk, Han Ji Hoo. In December 2006, there was changes in the members. Ji Hoo was removed from the group and replaced by Jung Yoonhak and Kim Jinchul (Jinon of F.Cuz). They performed in BIG4 Concert as GM6. In December 2006, before their debut, Kim Jinchul was removed from the group and replaced by an older trainee, Yoon Sungmo.
On September 21, 2007, they debut as Supernova with 6 members composed of Kim Sungje, Kim Kwangsoo, Song Jihyuk, Park Geonil, Jung Yoonhak and Yoon Sungmo. They performed HIT in KBS Music Bank. Like their name suggests, these six boys are gearing up to explode onto different entertainment venues, showing off their talents as singers, dancers, and actors. Their confidence stems from a two and a half years of extensive vocal, dancing, and acting training. In order to distinguish themselves from other boy bands, Supernova sports a formal look over casual attire - accentuating their masculine appeal. They are known for starring in music videos such as Seeya's & FT Island's. They have also performed at the Big4 Concert back in December 2006. They were featured on Mnet's M!Pick Season 6. The group was nominated for the Best Male Newface Group & Artist of the Year at MKMF 2007.
On 24 July 2008, the group visited Thailand for their first time, participating in showcases and other events.
On September 14, 2009, Supernova collaborated with T-ara to release a digital single, "T.T.L. (Time To Love)", a hip-hop song with electronic sounds. Among the members, only GeonIl, Kwang Soo and JiHyuk, together with T-ara's SoYeon, Hyomin, EunJung and Jiyeon were involved in this project. During the month of September, the seven of them actively promoted the song on the various music shows. A remix version of the song, "T.T.L. Listen 2", was released on October 9, with the MV featuring all the members from both groups. 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: "Kimidake wo Zutto", "Hikari", and "Superstar ~Reborn~". The first two singles are new releases, while "Superstar ~Reborn~" is a Japanese remix of their Korean single "Superstar". They released their first Japanese album, titled Hana, on October 21.
Supernova released their fourth Japanese single, "Last Kiss", in January 2010. The single's b-side "Ai Uta" (愛唄) is a cover of Japanese hip-hop group, GReeeN's song of the same name. Supernova returned to Korea as they revealed their comeback mv teaser for "On Days That I Missed You (그리운날에)" on August 12, 2010. And then they released their 1st mini Album "Time to Shine" on August 17, 2010. Finally they revealed the full mv for "On Days That I Missed You (그리운날에)" on the next day, August 18, 2010. Later, "Shining Star" is released as their comeback to j-pop industry. They held their "Choshinsei Show 2010" in Yokohama Arena on December 21, 2010 with around 13.000 fans attended the concert.
On late 2010, all members (except Yoonhak as he was busy filming "Love Kimchi") filmed their part for SBS new medical drama "SIGN" Geonil play as "Seo Yoon Hyung" leader of popular group, "VOICE" who was murdered during the group concert.
In early 2011, each member was focusing on more on individual activities in both Korea and Japan. Sungje was cast in "I Really Really Like You" with T-ara's Boram. Kwangsoo was cast on "Real School" sitcom with U-Kiss's Dongho, Kiseop and Eli. Following Sungje, Sungmo was cast in the "Coronation Ball" musical. Leader Yoonhak made himself busy by preparing for his Japanese drama, "Love Kimchi", which was broadcast for NHK's 70th Anniversary. He was also cast in a musical titled "Finding Kim Jong Wook" in Korea. Kwangsoo and Sungmo were both chosen as "K-Pop Zone" MC broadcast by MNet Japan. Jihyuk is also cast in the drama "Bachelor's Vegetable Store" as Yoon Ho-Jae. Yoonhak released a Japanese single named "Again" on March 21, 2012.
On April 17, 2012, Supernova released their new mini album entitled Stupid Love, after a long break from promoting in Korea. They will be promoting as a five-member group, as their leader Yoon Hak, is currently enlisted in the military.
On August 6, the group announced their second Korean comeback with their single album, '폭풍속으로 (She's Gone)' lit. Into The Storm. They made their official comeback in M! Countdown the 9th of August. Member Sungje took painkillers to endure the pain he acquired through an ankle injury. On December 19, Supernova released collection album "Supernova Collection", which contains 2 disc. First disc are compilation song from their previous album,and disc two contain 6 solo song.
Supernova released their sixth Japanese album "SIX" on December 3, 2013. Yunhak released a Japanese single "I Love All of You" on January 29, 2014 and his first Japanese album "STARTING OVER" on February 19. Member Sungje enlisted in the military in August. Supernova released their 18th Japanese single "Kitto" on March 4, 2015. On May 9, released two digital singles "blowin" and "girl friend". Their new album "7IRO (Nana Iro)"will be realese on September 9th.