Moderately interesting, very sterile visual detective about corruption in Seoul.
The characters are quite template, but generally readable. There is a small development of characters.
Also throughout the series there is a taste of naivety. It is not cynical, dirty and cruel enough.
I was pleased with the musical accompaniment, in many places - it works perfectly, creates suspense as it should.
In general, the series is not bad, average. It's quite possible to watch once.
And yes, the second season, in my opinion, contains a much weaker idea than the first. The first one is good.