This was a nice surprise... what started like a boring series (story-wise), got more intense as the episodes got on. The depecition of Inspector Chas past was done very well and the spidernet of corruption layed bare. Due to the end of this series I expect we will see a second series where they root out the corruption at the police again.
They did find a nice balance between action and detective work, also one case is interwoven most of the time with the next case is a novum of such series.
The cast was great, just the stereotype bad guys where a bit much, except Lee Taeju of course, he is just a very slimey but intelligent villain.
Overall a very enjoyable series.