Mert Demirci plays Sefa Ateşdağlı in A.B.İ., a character connected to Gülüşan and to the changing life of the Hancıoğlu family. Sefa witnesses how the family’s world shifts after Doğan’s presumed death and Saruhan’s rise to power. His connection to the port also places him close to the practical consequences of Saruhan’s control. Demirci brings a grounded quality to the role, helping the series connect its large power struggle with the everyday concerns of work, marriage and family responsibility.