Really bad
At first I have said OK, - maybe it is possible that you can kill a human with a slap on a face.
Then later I said OK, - nevermind, maybe it is just a bad acting (I am talking about the scene where Ayten was talking with her girlfriend's mother in the morning.)
Then later, Ayten's girlfriend was a few times in the same scene with a yellow "missing" poster. And she never thought of Ayten.
And also there was a line "you think you can find her in 20 million people Istanbul" - of course not. But then somehow, by accident, Ayten's girlfriend found Nejat. (But coudn't recall Ayten from the poster.)
And after these nonsenses I have stopped the movie. And only watched the ending which got so many comments about unexpected subtitles. Not good. Artsy fartsy ending at the end of realistic drama.
So overall I didn't like it a lot.
But I really like how Fatih put not so beutiful woman in the movie, and at first you hate her because of her looks. But then, after you get familiar with her character, you start a little bit to like her.