On April 8, 2011, MBN's news program "Exploring the Entertainment Industry" featured a segment following the daily lives of three trainees: Lee Bongjun, Seoju, and Kwon Jaehwan. They were introduced as members of the upcoming boy group N-SONIC, scheduled to debut the following month. Five months later than initially announced, N-SONIC debuted under CIIK Entertainment with their first digital single "We Are SuperBoys" on October 6, 2011.
The lineup included previously introduced members Lee Bongjun (now Black J) and Kwon Jaehwan (now J. Heart), along with new members Park Jonguk, Eunho, and Choi Byul. The group gained more recognition overseas, especially in Japan.
Their company shifted promotional activities there, and they held their first Japanese showcase on January 24, 2012. On September 9, after the group had wrapped up their Japanese promotions in June and returned to Korea, an announcement was made on the group's Daum Café. It stated that members Jonguk and Eunho had left the group after choosing not to renew their contracts to focus in their studies.
The same announcement also revealed that four new members would be added to the group, though their identities were not yet disclosed. One month later, they announced the four new members with a new set of profile pictures. The lineup then consisted of original members J.
Heart, Choi Byul, Black J, and new members Yun Jun, Sihoo, Minkee, and Zion. With the new lineup, they announced a comeback on May 2, 2013, with the digital single "N-SONIC 2nd Single". They officially returned on May 10.
On October 8, C2K Entertainment announced the departure of member Yun Jun. Now as six, N-SONIC released their first mini album Into The Light on October 25. During promotions, they held their first South Korean showcase.
On May 29, 2014, a comeback was announced with the digital single "Crazy". The single was released that day, followed by their second mini album, Reset, on June 9. After completing promotions for their second mini-album, the group once again focused on overseas activities.
After returning to Korea, N-SONIC announced a domestic comeback at a March 14, 2015 fanmeeting. They returned on March 24 with the mini-album Another Progress. That August, it was announced they would be featured in the Chinese web variety show Steal My Heart.
For the show, they released the original song "내 마음을 뺏어봐" (Chinese version: "取夺我心"), which became their fourth Korean and first Chinese single. On November 8, member J. Heart made his solo debut with the digital single "Call My Name".
On March 24, 2016 a new vieo was posted in N-SONIC's SNS, teasing a surprise comeback. They officially comebacked, days later, on the 30, with their fifth (korean) digital single "Excalibur". During overseas promotions in early 2016, member J.
Heart announced his impending military enlistment. After returning to Korea for final activities and a farewell fanmeeting, the members gradually ceased public contact, starting with Sion. Their agency, C2K Entertainment, stated they had lost contact with the group.
On May 26, J. Heart confirmed his enlistment, apologizing for the sudden news but not providing an explanation for the group's disappearance. Following this, all members submitted a unilateral request to terminate their contracts.
C2K Entertainment sued them for breach of contract and economic losses. On June 22, 2017, the Seoul Central District Court ruled in N-SONIC's favor in the initial lawsuit. C2K Entertainment appealed the decision.
In May 2018, the Supreme Court issued a final ruling in favor of C2K Entertainment, partially upholding their claims and effectively terminating the group's exclusive contracts. The group is presumed to have disbanded in 2016 following their disappearance.
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