[&] (read as "and") is the fourth extended play by South Korean girl group Loona.

The comeback marked the return of member HaSeul, who had been on hiatus due to health issues since early 2020.

[3][4] They also shared a cryptic teaser image containing the Latin words "citius, altius, fortius.

[5][6] The following day a teaser image titled "XII" was released featuring twelve eyes, confirming the return of member HaSeul, who did not take part in the group's last two promotional cycles to focus on her mental health.

[7] HaSeul also opened up about doing group activities again saying:[8][9] "Because it has been two years since I participated in a comeback, I prepared a lot for this one.

Then, a drum plays in the intense red lighting, heralding that the beginning of a huge worldview has risen, and Kim Lip, wearing a red school uniform connected to her solo and unit worldviews, stands on the altar located in the center of the temple.

[12] [&] features different sound that navigate from Bollywood-esque details, Korean ballad fairytale-like chimes and strings, quirky jazz, radio friendly power pop and dance-pop songs and ballads, and even the minimalistic traits of Korean indie R&B trends and rough lo-fi sounds.

[15] "Wow" is a groovy jazz styled and broadway inspired song with bouncing tempo, a refreshing up-tempo melody and an upbeat chorus.

[22] Verónica A. Bastardo of The Quietus gave the extended play a very positive review calling all tracks on the album enjoyable.

She ended her review by saying: "Loona came back with an album that hits just right when you want to cement yourself as a pop reference in a worldwide music audience".

She remarked that this inclination to look beyond the routine will, undoubtedly, continue to set the girl group apart in the years to come.