series was directed by Mert Baykal and Nükhet Bıçakçı served as the scriptwriter. The responsibility for styling was undertaken by Başak Dizer Tatlıtuğ and Deniz Marşan, but the name of the pair was not included in the main title for the first three episodes. The series was produced by Kerem Çatay and Pelin Diştaş. Inspirations and references The name of the series comes from the Greek letter phi, which is used to express the golden ratio, and is used as the name of Azra Kohen's novel on which the series is based on. In the second episode, Deniz (Mehmet Günsür) takes Duru (Serenay Sarıkaya) to a garden and presents her with a lemon tree as a gift. The scene was included as a reference to Serenay Sarıkaya's first movie Limon Ağacı (Lemon Tree). Music Depending on the main subject of each episode, students studying at the Faculty of Fine Arts made and performed different types of music and sounds. But in general, the music of the series, including the main title's music were composed by Cem Öget. In the eighth episode of the first season, Dicle Olcay, accompanied by Deniz and other students, performed a piece called "Aç Kapıyı Gir İçeri" (originally performed by the singer Mavi). For the first season's finale Muhyiddin Abdal's poem "İnsan İnsan" was composed into a song by Fazıl Say and performed by Güvenç Dağüstün, Cem Adrian, Selva Erdener, and Burcu Uyar. The piece originally appeared on Fazıl Say's 2013 album İlk Şarkılar, and according to Burcu Uyar it had been initially prepared for a movie, but the production stopped and the movie got cancelled. Release In January 2017, it was announced that the series would consist of a total of two seasons, each season consisting of 13 episodes, and five episodes would be published each month. In addition, it was added that multiple episodes would be published in one specific week, rather than releasing a single episode every week. On 31 March 2017, the series' premiere was held at Volkswagen Arena in Istanbul and after showing an 18-minute special preview, the first three episodes of Fi were released on Puhu TV. The first seasons's fourth, fifth, and sixth episodes were published on 21 April 2017. The next three episodes were set to be released on 19 May 2017, but at the request of Serenay Sarıkaya, the seventh episode was released on 5 May. Later,