I usually review something at least three weeks after I have watched it. If something has left a lasting impression good or bad, and its made me think, then I review it. Some things are just wallpaper, some seem OK at the time, but leave a bad aftertaste, and some appear trivial, but I later see it has made me think about an issue or the script.
The events in S2 take place three years after S1, and after S1 ended I actually thought it would be much darker. 20 eps condensed to 10 eps, means to get to a meaningful conclusion, we hope, means the plot has to motor along. One of my grips in K drama is there are a lot of time fillers, when really if you cut the programmers to a more manageable 12 eps, there wouldn't be so much dead space. I wonder if actors contracted to other project influenced the time scale, and it was a case of produce this or leave it for perhaps a very long time.
So S2, is excellent but different, it has to be because it has a lot to cover in a very short, k-drama wise, space of time. I come from the UK and most dramas only have 8eps, even the most popular ones, so I am used to a fast pace. It has managed to maintain most of the plot threads, the humour, the running joke and even added a new one. If you live with a retired man it is completely accurate. The fact that they have managed to keep most of the original cast is amazing.
So don't compare apples with oranges, just be glad you got a chance to eat the fruit.