4 Walls

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## 4 Walls

* Digital
* Orange
* White
* Kihno

## General Information

### Format

Digital Download, CD, Smart Music (Kihno)

## Album Credits

### Label

SM Entertainment

**4 Walls** is the fourth studio album by girl group f(x). It was released on October 27, 2015 with "4 Walls" serving as the title track. It is the group's first release after member Sulli's departure. It is also f(x)'s first and only Kihno smart music album release.

The song was released as a single in conjunction with the release of the album. The record's musical styles are diverse, incorporating the group's signature electropop and synthpop sound with elements of various genres including house, EDM and UK garage.

## Description

### Activities

f(x) announced to be working on its then-forthcoming studio album on September 11, 2015, when the group traveled to Jeju Island to film a music video. The album, titled *4 Walls*, was released digitally worldwide on October 27, 2015 by SM Entertainment. In South Korea, the album was distributed digitally and physically by S.M. Entertainment and KT Music. The music video for the title track "4 Walls" was released simultaneously. The song impacted Korean Broadcasting System's "K-Pop Connection" radio on October 29.

The girl group f(x) had been known as a five-member girl group, with its original lineup consisting of members Krystal, Amber, Victoria, Sulli, and Luna. The group's last release as a five-member group was *Red Light*, released in July 2014. During the promotion of *Red Light*, member Sulli did not participate in live performances due to her "suffering from continual negative comments and false rumors," according to the group's parent company S.M. Entertainment's official statement on July 25, 2014. f(x)'s promotional activities thereafter involved the four other members, while Sulli took a career hiatus. On August 7, 2015, it was announced that Sulli had officially withdrawn from the group to focus on her acting career, and f(x) would continue to promote as a four-member group.

Following the release of the album, f(x) appeared and performed on several music programs. Its first televised appearance was on October 29, 2015 on Mnet's *M Countdown*, where the group performed "4 Walls" and "Diamond". The group subsequently appeared on KBS' *Music Bank* and MBC's *Show! Music Core* on the two following days, respectively. To further promote the album, f(x) embarked on the concert tour Dimension 4 – Docking Station, which was its first concert tour since their debut in 2009.The tour kicked off in Seoul, South Korea at Olympic Parkfrom January 29 to 31, 2016, and further included six shows in four cities of Japan: Tokyo, Fukuoka, Osaka and Nagoya. The tour lasted from February 20 to 28, 2016.

### Reviews

The album received favorable reviews from music critics, who noted that the other members had the opportunity to showcase their vocal abilities more following the departure of Sulli. The release peaked atop South Korea's Gaon Album Chart and has sold over 76,000 physical copies in the country as of January 2016; in addition, *4 Walls* topped the *Billboard* World Albums Chart and charted at number thirty-nine on the Japanese Oricon Albums Chart. The single "4 Walls", meanwhile, peaked at numbers two on the Gaon Digital Chart and the *Billboard* World Digital Songs.

## Promotional Photos

### f(x)

Amber, LunaVictoria, Luna, KrystalVictoria, LunaAmber, KrystalAmber, Luna, KrystalVictoria, Luna, Krystal