I just finished this drama and i am really satisfied. The story is captivating, especially the cases.
The last two episodes have a lot of "fillers" cause the drama initially was meant to have 16 episodes but due to the large success it became a 18 episodes serie.
The actors are really good, especially Lee Jong Suk and Kim Kwang Gyu (he always made me laugh!).
I loved instrumental music (my favourite tracks of the ost are Return and Verdict) but i dislike the opening song, it is annoying.