The band's final lineup consisted of Seo Youngjun (Jun), Lee Kyumin (Kei) and Kim Hyoseok (AKi) The part "Led" in LEDApple stood for "Logic Egoism Delete" and was promoted during their debut but they stopped referring to it since their CODA mini-album was released.

[2] The band made their debut on October 6, 2010, with their promotional single, "Dash" (Korean: 대쉬), a remake of Baek Ji-young's song of the same name.

[7] On October 6, 2010, Led Apple performed their debut promotional single "Dash", which is a remake of a song originally sung by Baek Ji-young at the Busan International Film Festival and the music video was released the next day.

[9] On February 1, 2011, member I-OH announced his departure from the group on Twitter due to tuberculosis,[10] however he did state that he would remain with the company.

[14][15] However, the band faced another controversy after many internet communities claimed that Led Apple's single "Niga Mwonde" had plagiarized CN Blue's song, "Love".

[16] However, Starkim Entertainment later released a statement addressing the plagiarism issue, stating that both songs were composed by Lee Sang-ho which is why they sounded similar.

[18] The song was released in an attempt to make anti-fans realise that their hate comments can cause idols to do extreme things out of their misery.

After ending their promotions for the Niga Mwonde mini-album, leader Jaehoon left the band citing personal reasons; no other information was disclosed.

On October 28, 2011, the band announced a new member would be joining them for their upcoming single, Keon U who is well known as the son of famous composer, Park Kwang-hyun.

Ran Into You By Chance) was released on November 11 and it featured former SeeYa member, Nam Gyu-ri as a cyborg and love interest in the video.

[24] In the week beginning December 2, the band's mini-album, CODA managed to reach an impressive number six on the Gaon Chart.

[32] On March 5, Led Apple announced on their Facebook page that the band would cease their promotions for "Time Is Up" and be releasing a new digital single titled, "Sadness".

[36] The band performed four of their songs as part of the concert's finale and later expressed their desire to come back to Japan during the press conference.

[37] On March 26, Led Apple released the music video for "Sadness" and the song peaked at number 58 on the Gaon Chart.

[38] After ending their promotions for "Sadness", the group announced that they would be holding their first solo concert titled, Now Playing – Led Apple in Seoul, Vol.

[43] Their second solo concert was held on June 23, at the Shinagawa Prince Stellar Ball in Tokyo, however Keon U was unable to perform alongside the group due to health problems.

Hanbyul stated that his desire to pursue a solo career motivated his choice to leave the group, whilst Kyumin asserted that he wanted to launch himself into the Hip-Hop genre.