I really wanted to like this drama, but it was just taxing. Finishing this was extremely tedious, and this coming from one of Cha Eunwoo's fans is quite something.
Story: the story was pretty simple, it's pretty much what the synopsis in MDL reads. given that there are not many "events" happening or not many plot twists in every episode, this story tried to bank heavily on the 'emotions' quotient. But that was both its boon and bane. It truly revealed the acting abilities of the actors, all of whom played their characters with such perfection that it was very good to see mature, serious performances like these on screen. But on the other hand, the more the series tried to invest in emotions, the slower it got, and hence, more boring. If there is a pause of a minimum of 20 seconds between one actor's lines and another 20-second pause before the next actor speaks their lines, then you know something is wrong here. And then every crying scene (and there are PLENTY) lasts for a minute at least... its just a bit too much. In the middle of all this slow slow emotion-building exercise, the story gets lost completely, and we are left to watch just people crying. So yeah, in terms of the story, nothing really happens.
Pace: In case I haven't said this enough, this drama is SLOW. It starts off slowly, builds up slowly, but by the 6-7th episode, picks up pace. But then again, he decides to slow things down and it becomes a slow burn again by the 9th episode; episodes 10-12 are painful to watch. I ended up watching the last 2 episodes at 1.5x speed, and they made so much more sense at that speed.
Acting: Really lovely acting by all the actors. This was one of the most understated roles that CEW has ever played. Funnily, its not like he has done anything different in terms of how he acts, but it was more like his brand of acting got cast in a sombre, no-nonsense role, instead of being cast in the same old brooding lover boy role. But either way, it was only the acting of all the actors that made the series watchable.
The OST was quite nice, especially the cover of "What a Wonderful World."

Overall, if you want to watch it because of CEW, you can, but otherwise, not watching it won't be a loss either. If at all you want to watch it, watch it on 1.5x or 2x speed, that's a better alternative. But on an ending note, this drama deserves praise for being quite liberal thinking... full 100 points to showing strong, independent women; grey areas of marital relationships; dicey family relationships; and people who are not completely good or bad. These nuances made the drama quite watchable. If it had been a little faster, it would've been one of the best dramas I've watched this year.