Apink is a six-member South Korean girl group. They released their first album, Seven Springs of Apink, on April 19 2011, and rose steadily in popularity. Their official debut was April 21, 2011 on M! Countdown. They were named "A Pink" because "A" stands for the girls always showing an "Amazing" performance while "Pink" is known to be the group's favorite color.

On January 10, 2015, Apink became the first group to win five consecutive awards on Music Core. The same month, the group received the "Digital Bonsang" and "Best Female Performance Group" awards at the 29th Golden Disk Awards in Beijing, "Bonsang" and "Popularity" awards at the Seoul Music Awards, "Best Female Group" at the Korean Culture and Entertainment Awards and "Best Single of December" at the Gaon Chart K-Pop Awards. Their first headlining concert, billed as 'Pink Paradise', was held in Olympic Hall, Olympic Park, on January 30 and 31. The 7,200 concert tickets sold out within two minutes after going on sale. Apink released a Japanese version of "Mr. Chu" on February 18, 2015, which also included a Japanese version of "Hush". It reached number 2 on Oricon's weekly singles chart, selling 54,000 copies the first week of its release.

In February 2015, Apink entered Forbes Korea's Korea Power Celebrity 40 for the first time at number 18. That same month, the group was chosen as one of the "Best 3 New Artists (Asia)" at the Japan Gold Disc Awards, held by the Recording Industry Association of Japan.

Apink headlined their first overseas concert "Pink Paradise" in Singapore at The MAX Pavilion on March 22. They appeared at the Korean Times Music Festival in Los Angeles in May, Music Bank event in Hanoi, Vietnam and performed "Pink Paradise in Shanghai.

Apink released a single entitled "Promise U" on April 19, written by Jung Eun-ji to commemorate the group's fourth anniversary. A Japanese version of "Luv" was released on May 20 as their third single, with "Good Morning Baby" as the B-side. They performed the song for the first time at the "Girls Award 2015 Spring/Summer" in Tokyo on April 29 ahead of the release.

On July 16, the group released their second full-length album, Pink Memory, along with the title track "Remember".  On August 22 and 23, the group held its second concert "Pink Island" at Jamsil Indoor Stadium, after which they began overseas activities including a fan meeting in Thailand, a concert tour in Japan and a performance at MTV World Stage Malaysia 2015. On August 26 the group released their first Japanese full-length album Pink Season.