I liked the show a lot, but I guess we could have less episodes and still wrap it brilliantly. 16 was enough, I got lost and confused at times, the added so many "new" serial killers when they could easily just focus on Berum story who they had a lot show.
Yo han had his name cleared finally, they could have focused on Hong Joo story a little bit more, the parts they added was very satisfying I wish we could have more of that.
The acting was great I love shows with underated actors, even though Lee Seung Ki is very famous and brilliant.
Anyways great show and amazing ending.