Jihyo noted that the song is about "asking for truthfulness and sincerity from a person who is full of his/herself and doesn't realize what pure love is".

At the end of the music video of Twice's first English single, " The Feels", a full-length album scheduled to be released in November 2021 was teased. Formula of Love: O+T=˂3 is the third full-length studio album by South Korean girl group, JYP Entertainment’s TWICE, set to be released on November 12, 2021. The physical album comes in five versions: Study About Love, Break It, Explosion, Full of Love and Result File.In his review for Sputnikmusic, Raul Stanciu proclaimed "Icon" as the "most swag [track that] Twice can offer". The song's genre was variously described as city pop-inspired, [16] dance-pop and future funk, [12] and disco-pop, [1] accompanied by elements of 1980s soul and hip-hop. It is followed by English track "Moonlight", a disco-pop song that incorporates " funky" orchestration reminiscent of the 1980s.

Their latest album Formula of Love: O+T = <3, was released earlier this year to critical acclaim, and quickly became a fan favorite with millions of streams worldwide. best K-pop albums of 2021: Twice, Red Velvet, NCT 127, Seventeen and Monsta X are all there, but who took the No 1 spot?Hours before the official release of Formula of Love: O+T=<3, the group went live on YouTube and V Live to discuss the making-of the album. The seventh track, "Last Waltz", is a Latin pop-inspired song that includes an interpolation of Tchaikovsky's " Waltz of the Flowers".

On October 20, 2021, during the group's sixth anniversary week, Twice held a livestreaming event titled H6me Party with 6nce, where they sang "Candy", an English song from the album dedicated to their fans.The fifth track, "Real You", written by Jihyo, is a disco-pop song characterized by a bouncy rhythm and "catchy" bass line on top of a "trendy" funky sound. Formula of Love marks the first time ever that TWICE released songs in which not all 9 members participate. Another English song, "Icon", is a "hard-hitting" and "sensual" [12] synth-pop track with elements of reggae-pop. In the United States, four limited digital editions were released on November 17 and 18, with digitally signed cover arts.

The letters O and T represent the initials of Once—the group's official fandom's name—and Twice, respectively, while the heart symbol ( <3) represents love; thus, the "formula of love" can be verbalized as "Once plus Twice equals love". Formula of Love: O+T=<3 was first teased by Twice member Chaeyoung on September 13, 2021, in the behind-the-scenes video for her photoshoot with OhBoy! It debuted at number three on the Billboard 200 with 66,000 album-equivalent units, becoming the group's fourth and highest entry on the chart. The track “Candy” was performed on TWICE’s 6th Anniversary celebration H6ME PARTY with 6NCE, on October 29, 2021, before its official release.She also noted that the song is about "the feeling of uneasiness from the uncertain future of a relationship". out of 5 rating, praising Twice and the album's producers for presenting a "cohesive record", but stressed that it "could have been trimmed to 10 strong cuts". TWICE Release First English-Language Single 'The Feels,' Dance the Night Away in Video's Epic Prom". On October 24, JYP Entertainment released a mockumentary-style trailer featuring Twice members dressed up as scientists at the "Twice Love Lab".