Despite earlier reports of Red Velvet having a summer comeback,[2] SM Entertainment announced that the group would release a new album in September.

[3] Member and leader Irene talked about the difficulties the group faced while preparing for the album on the September 9 broadcast of the radio show Super Junior's Kiss the Radio and stated that it was "physically and mentally tiring as the comeback date kept getting postponed".

[7] "Lucky Girl" is a retro-style dance-pop song produced by Hayley Aitken and Ollipop with lyrics written by Kenzie.

"Fool" is an acoustic pop song written by January 8 of Jam Factory and composed by Malin Johansson and Josef Melin.

[11] Tamar Herman of Billboard wrote that the song was "more saccharine than their typical sound" and described the music video as a "bubbly, athletic-themed music video that offered fun times for all as a murderous ode to The Simpsons' impish duo Itchy and Scratchy.

Taylor Glasby commented that the video "has a sinister combination of sweetness and threat" and called the song "devilishly satisfying".

[13][14] Bradley Stern of PopCrush called the title track a "perky, retro-sounding electro-pop tune" that was expected from most k-pop idols, and praised the black comedy in the song's music video.

[17][18] "Russian Roulette" became the most-viewed K-pop music video for the month of September in America and worldwide.