The good:
1. Jang Hyuk - One of his finest acting in action-drama. He's like a mad dog when he's angry and just as passionate when trying to find victims and suspects.
2. Lee Jin Wook - The captain of the rescue team in Voice2. Another mad dog and also very convincing. I'm going to look out for his other dramas.
3. The crimes - The reported crimes are ones you really hear in the news. Gory most of the time. When the rescue team is on the move that's what fuels this drama.

The bad:
1. Kang's expressionless face - How can an actress be so devoid of facial expression? Each of her headshots looks exactly the same no matter the situation.
2. Kang's expressionless voice - The same monotone. Sometimes fast, sometimes faster. The same monotone.
3. Kang's selective hearing - Ok, she has a gift of hearing things others can't hear. But i think her real gift is that she can hear only those things that are relevant to the situation. Come on writer, if you want to show that she has a special gift, at least give a reason why her gift is very selective. otherwise, you should show that she actually hears soooo many things that it would drive her crazy.
4. In both seasons the writer has the habit of making the golden time team interview the caller first about non-urgent details before actually sending emergency teams to the scene. Drives me crazy each time.

I'm here for the crime-solving. everything else and especially Kang is a distraction.