Mr.Mr. (song)

The song was composed by American production team The Underdogs, who had previously worked with Western artists including Britney Spears, Beyoncé, and Justin Timberlake.

was composed by American production team The Underdogs (Harvey Mason Jr., Damon Thomas, Andrew Hey, Mike Daley, Britt Burton, and Rodnae "Chikk" Bell), with Korean lyrics by Cho Yoon-kyung and Kim Hee-jeong (Jam Factory), who have written lyrics for Girls' Generation for eight years.

[3][4] The Underdogs had previously worked with Western artists including Britney Spears, Beyoncé, and Justin Timberlake.

[5] The song was released to South Korean KBS Radio Station on February 25, 2014, as a single from the EP of the same name (2014).

[1][8] An editor from Yonhap characterized it as an "electropop dance" song featuring elements of R&B,[5] and Heather Phares, writing for AllMusic, noted that it "mixed a hip hop beat and EDM-inspired buildups" in its composition.

However, the release date was postponed to February 28 due to the accidental deletion of some of the original shots, which necessitated re-filming the affected scenes.

[10] The music video was choreographed by Jillian Meyer (who had previously collaborated with artists including Janet Jackson and Kylie Minogue) and two members of BeatBurger – Shim Jae-won and Greg Hwang.

[15] Group member Sooyoung argued that "Our new music video has the concept of encouraging and boosting the confidence of those men who have lost courage".

[16] The visual received positive reviews from media outlets; Fuse labelled it "cinematic" and praised its "sophisticated" class,[17] and Popdust's Jacques Peterson hailed the video as "the hottest episode of Grey's Anatomy ever".

and the EP, Girls' Generation made several appearances on South Korean music programs around February and March 2014.

Jeff Benjamin from Billboard magazine hailed the single as "super-strong, super-sweet" and labelled it a welcome change compared to the group's previous "stupid-catchy" releases.

She wrote that "Fans [...] won’t be disappointed by their latest dance-friendly single" and added that "the addition of a scratchy electronic bass line and a hint of darkness" should attract listeners who were not used to their signature bubblegum pop sound.