Stranger 2 is different from Stranger 1 in many ways, e.g. here we have - alphabetically - police vs. prosecutors as leitmotiv (and the "incest" between the two that has been hinted throughout the episodes, but has not fully come to light).
I am glad about that, because some series start great, and then just rehash the same stuff.
Having said that, I am wondering why Stranger 1 steadily increased its viewers share (in Korea) from 3% to 7%, but this series is stuck as a yoyo between 6% and 7.5%: market saturation for this kind of series?
In all fairness, one cannot write a complete review until the series is over, and there are so many loose ends right now, that I am expecting a great finale.