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One Shot is the fourth EP by South Korean group B.A.P released  on February 12, 2012, under the label of TS Entertainment. It features singles "빗소리 (Rain Sound)" and "One Shot".

Production background
The album title "One Shot" was revealed on February 7, 2013 when TS Entertainment released B.A.P's "One Shot" teaser video. Teaser photos of the group members were also released, beginning with Kim Him Chan and Bang Yong Guk on February 4, Jung Dae Hyun and Yoo Young Jae on February 5, and, lastly, maknaes Moon Jong Up and Zelo on February 6.

The first single from the EP is a pop-rock ballad "Goodbye" that features falsetto vocals and strong rap. The

The second and lead single “No Mercy” is composed and produced by Marco and Jeon Daun of TS Entertainment. Once again member Yong Guk 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 third track is a hip hop-ballad song "Voicemail" and the first by the group that is entirely written by member Yong Guk. The song is about having a regret after a breakup. It also integrates the use of phone sounds in the instrumental.

The title song from the repackage version of the EP released on August 30, 2012, "Crash", is the work of Duble Sidekick and expresses the feelings of falling in love. The track has British rock base mixed with guitar sounds.

Release history
No Mercy was released digitally on July 19, 2012 under the label of TS Entertainment. The physical release was originally scheduled to be on July 19, 2012 as well but was delayed to July 24, 2012 because of the problems with the finished product. The special single "Goodbye" was released 10 days ahead of the album release whereas the lead single "No Mercy" was released on the same date as the album. On August 30, 2012, the repackaged version of the EP, renamed Crash, was released.

Tracklisting
※ Bold at the space of "Tracks" means promotional singles in each album.

Promotion
B.A.P made their first live broadcast appearance promoting the EP on the July 19, 2012 on an episode of M! Countdown, This was followed by appearances on Music Bank on the July 20, Show! Music Core on the July 21, and Inkigayo on the July 22.

The short animated music video for the track "Goodbye" was released on July 9, 2012 through YouTube along with the digital release of the special single. The video features the group's mascot concept of the Matoki which is an alien species that crash-landed on Earth, explaining the mythical origin of the group. The jacket photo of “Goodbye” reminded fans of The Beatles' Abbey Road album art cover photo.

The 48 seconds teaser clip for the music video of the title track "No Mercy" was released on July 17, 2012 while the full version was released a day later. It was directed by Hong Won-ki of Johnny Bros., who is famously known for directing music videos for Seo Taeji, Super Junior, Girls Generation, Secret and Beast. The video was also released through YouTube.