the series was announced by puhutv as Fi in March 2017 and the first promotional poster was published. Nükhet Bıçakçı adapted the novel series to prepare the screenplay of the television series. The first promotional video of the series was released on 10 March 2017. On 31 March 2017, the release date for the first three episodes was announced. On 25 March 2017, it was reported that telecommunication company Vodafone would sponsor the series, and it announced to its customers that they could watch Fi for 6 months without paying any internet fees. In December 2017, author Azra Kohen appeared on Radyo Trafik Marmara's radio program Yazarın Dilinden and announced that the TV series would finish with two seasons in total. She added that she did not want the series to continue by saying that the series was planned to last 4 seasons but the second season had become deviated from the books and that the only thing remaining constant were the characters. In the interview, Azra Kohen said that in the first season "after the first three episodes the reference points had remained the same, [...], but they tell a completely different story afterwards". But the production company was planning to complete the project with two seasons from the beginning due to the lack of action in the first two books and Habertürks writer Mustafa Doğan claimed that it was the production company, not Kohen, who had decided to finish the series earlier. Kohen, in turn, said that in the contract with the production company it was mentioned that "The series cannot in any way go away from the essence of the book and its characters and cannot go beyond its meaning" and it was her who had taken the decision for the terminating the series and also wrote a book about her experiences during this process. Casting The first choice to portray the character Can Manay was Ozan Güven since the beginning, and it was confirmed by Kohen's colleague Ebru, who stated: "We were so obsessed with Ozan Güven that we would have done anything to make him accept the role". The other two alternative choices for the role were Cem Yılmaz and Okan Bayülgen. Members of the main cast gave an interview to Vogue Türkiye which was published in April 2017. Ozan Güven stated that he had accepted the role "due to its different nature compared to