There was good acting, good music, good hidden mystery. But when it went from story outline to actual scenes, it started to seem unrealistic and not always convincing .. There was also many shifts in story focus connected by the main thread - mystery behind Park Wonseok's death. Which did make it interesting, but I think it all opened up having more holes and weak logic.

And really, if I start talking about the police work I'll be here all day.

Overall, it's just an ok watch.. better to watch as airing drama I think - you'll forget to keep track of a lot of things.