N-Sonic is a South Korean boy band consisting of J-Heart, Min-ki, Si-hoo, Choi Byul, Zion, and Bong-jun. They released their first EP, We are Super Boys on October 6, 2011. N-Sonic debuted the 6 October 2011 with their EP we are super boys, the group at that time consisted of 5 members : J.Heart, Eunho, Jonguk, Bong Jun and Byul. Without great success in Korea, the group was very active abroad, mostly in Japan and China. The 3 February 2012, N-Sonic made their first concert in Japan. The 16 February of the same year was announced their fandom name : Super Sonic. After a concert in Japan, members Eunho and Jonguk left the group the 25 February for personal reasons. In was later announced that N-Sonic will have 4 new members. They were revealed the 10 October 2012, thus N-Sonic welcomed new members: Zion, Minkee, YunJun and Sihoo and became a 6-member group.

In 2013 despite having a Korean comeback in March then in October, the group was mostly promoting in Japan, participating in a lot of summer concerts. The 8 October 2013, member Yunjun leaved the group for personal reason. They also did their first fan meeting and their first solo full concert in December of the same year, in Japan again.

In 2014, the group released their first mandarin single, representing their debut in china. From end of 2014 to 2016 they were active in Japan and Korea mostly; they had numerous comebacks. In 2016, After concerts in Japan the group returned in Korea the 9 May and all the members went missing; failing to be appear or giving updates to the company, C2K Entertainment had to cancel multiple events including broadcasts and a fan meeting scheduled before the enlistment of leader J.Heart. With all the schedules canceled, the company decided to sue the members in court for damages resulting from their breach of contract. C2K entertainment stated This incident caused great damage to [N-Sonic’s] juniors, who were preparing to debut, as well as financial harm to the company. It was also revealed that the members requested the termination of their seven-year contract.

On the 22 June 2017, the Seoul Central District Court’s civil affairs department ruled against the plaintiff, C2K entertainment, therefore the members didn't have to pay any compensation. Following the ruling, N-Sonic member Sihoo wrote on his Instagram account, “Truth and justice will always prevail.”.- Wikipedia