The subgroup TTS was born because members Taeyeon, Tiffany, and Seohyun wanted to carry on with their music activities.

[10] TTS became the first subgroup to achieve a "triple crown" on South Korean music shows, reigning in the number 1 spot for three weeks in a row.

[7] During an interview with Billboard, the three singers shared, "This album was really personal for us and it was fun ... to put out a much more raw side of our music ... the music we put together has so much more layers, so much more depth to it in terms of sound, choruses or harmonizing together ... Our main goal was to not be visually entertaining, but be vocally entertaining."

They also revealed that Seohyun wrote the lyrics to one of the songs, "Only U",[16] while Tiffany served as the visual director to the concept of "Holler" music video.

[22] As an effort to support music education for children in Asia, TTS contributed a part of the album's sales profits to a charity called "SMile for U", a campaign held between SM Entertainment and UNICEF.