The title of the EP was revealed on July 12, 2012, along with the album cover and track listing. The album jacket photos of the individual members were released on July 15 and 16, 2012, which introduced the urban pop boy concept for the promotions. The first single from the EP is a
pop-rock ballad, "Goodbye". It features falsetto vocals and a strong rap. The song was composed by Jeon Daun, who also wrote
G.NA's "Because You're My Person" and
K.Will's "Struck Dumb", along with B.A.P member
Yongguk. Yongguk also helped to pen the lyrics. "Goodbye" also featured guitarist TOP, who worked with
Seo Taeji for over 10 years. The song and its music video were released digitally on July 9, 2012. The second single, title track "No Mercy", is composed and produced by Marco and Jeon Daun of
TS Entertainment. B.A.P member Yongguk helped with the lyrics. The rapping parts of the song utilizes the
Gyeongsangdo dialect. It also makes use of "
samul nori", a type of traditional Korean
percussion music. This song is quite similar in comparison with group's previous singles "
Warrior" and "Power", as it brings back many of the group's signature style, especially the use of whistles in the instrumental. The song was released digitally on July 18, 2012. The
No Mercy EP was released on July 19, 2012. The repackaged version of the EP, entitled
Crash (대박사건) and its title track were released on August 30, 2012. The song is the work of Duble Sidekick, and has a British rock base mixed with guitar sounds. It contains elements of
pop rock,
dance-rock and
teen pop. Non-promotional album track "Voicemail" is a
hip hop-ballad song and the first by the group that is entirely written by member Yongguk. It integrates the use of phone sounds in the instrumental. ==Promotion==