Fi

Fi is a Turkish psychological thriller series, one of the country's first internet dramas, adapted from Azra Kohen's novel trilogy Fi, Çi and Pi. Produced by Ay Yapım, directed by Mert Baykal and scripted by Nükhet Bıçakçı, it began streaming on puhutv on 31 March 2017 and concluded with its 22nd episode on 9 March 2018 after two seasons, later also airing on Show TV.

The first season follows Can Manay, a psychiatrist who teaches at a university and hosts a therapy program on television, as he develops an obsessive love for Duru, a woman he meets by chance, while journalist Özge Egeli becomes determined to expose his dark past. The lead roles are shared by Ozan Güven, Serenay Sarıkaya, Mehmet Günsür, Berrak Tüzünataç and Büşra Develi. The series drew 3.5 million viewers within 50 hours of its first three episodes.