Metin could be talking to Eren. Probably telling him he should stop Ilgaz Metin is really the last one to talk after everything he did.
Tbh Pars was always like this. We just didn’t want to see it because he is funny and liked how he worked together with them to arrest Engin. Pars is selfish. He just wants to close this case as soon as possible and impress the head prosecutor. He only works with Ilgaz when he needs something. As soon as they found Engin, he told Eren that the partnership was over. And he ran to the head prosecutor to get the case so that he could control the whole thing. If they start an investigation his secret will be out. Yekta is also putting pressure on him.
Yes all the evidence point to Ceylin, but she had bruises all over her, she was in shock and doesn’t remember anything. And it’s not like she would run away. He should have never questioned her without a lawyer. He is acting as if he is doing everything according to the law, but he already is breaking the law by protecting his sister and hiding what she did. I think he is also doing this to take revenge, because they revealed his secret about his illness. He refuses to believe that it wasn’t Ilgaz.