9 Twice Group Photo Cards - Formula of Love, measuring approximately 8.6 x 5.4 cm.

"Formula of love" is Twice's fifth studio album, released on November 1, 2021. The album consists of ten songs, including lead single "Scientist".

Other songs on the album include "Moonlight", "Miracle", "Precious Love" and "Heaven".
According to Twice, the album is centered around the theme of love, touching on different aspects of love and relationships.