I watched the series in one day. When I was about to go to sleep there was a huge twist so I couldn't leave it.
The actors were perfect. The main male lead, I remember him from other dramas, and like him. The main female lead, I do not know her but she did a very good job and watch her in the future. Loved the drama overall but I wished...for... a better ending.
What really bothered me, and not only here, like in many police dramas, the chief (of Team 1) is an abuser. Is this acceptable in S. Korea? If he behaved like that towards me I wouldn't be quite.
Overall watch the drama it is good.