Overall it's a good drama, the acting and the cinematography are pretty good and I did enjoyed watching it. Also the length of the whole series and episodes is really pleasant. However, it's nothing really new, it's a pretty basic story: One impulsive kill - keeps killing - some cop playing a bigger role.
I wouldn't say it's a 'must watch' but if you like thriller and all you really should give it a chance!
I also really liked the ending, it was neither expected nor unexpected, neither good nor bad. I'm wondering if there's more to come or if this is really the ending!