The trio was formed with main vocalist and guitarist Lim Heon-il, bassist Yang Si-on, and drummer Kim Jun-ho.

Lim Heon-il and Yang Si-on attended the same high school and they enrolled at the Seoul Institute of the Arts, where they met Kim Jun-ho.

[1] Lim cited the precision of the negative expression "this is not" in contrast to the affirmative phrase "this is" that led to the decision of implementing the paradoxical moniker to describe their music.

[5] The band held a pair of concerts at Muse Live Hall in Seoul Olympic Park that weekend in commemoration of the album's release.

[5] The band forged their music as "a mixture of garage-rock-like guitar riffs and bluesy tones" and has delved into various genres, including punk rock and EDM.

[3] Their song "Do It" opens with a hip hop beat and progresses into an electric number with "intense" guitar riffs, "heavy" drums, and violin by Echae Kang.

[3] Online magazine Mint Paper commended his "stand-out" singing on the single album Color, where iamnot worked with groups Common Ground and The Barberettes on Motown-esque tracks.