Mustafa Üstündağ plays Saruhan Nadiroğlu, one of the most dangerous forces in A.B.İ. Saruhan wants to expand his influence and protect the dark system he has built around himself. He uses fear, manipulation and carefully planned pressure to control the people around him, but his confidence is repeatedly challenged by Doğan and by enemies he cannot easily identify. His relationship with Rüya reveals a more personal side beneath his ambition, while his connection with Leyla creates another source of emotional tension. Üstündağ gives Saruhan a commanding and unpredictable presence that drives the series’ central conflict.