After having watched the first 2 episodes I feel that this drama has a lot of potential. The show has a great vibe, there was a lot of wholesomeness in these two hours. I came in expecting something along the lines of WWWSK and Her Private Life, but this is a way more realistic story, with more down to earth characters. In my opinion Park Min Young's best performance was in Healer and in this drama she plays a similar, but somewhat darker character.
About that melodrama tag, yes it makes sense, but it's pretty chill for melo, kind of like how it was in Encounter.
To sum it up it's an easy 10/10 based on 2 episodes, I have high hopes for this one.

And here are my (spoilery) thoughts after seeing the rest of the show:

The things that I wrote about the first two episodes hold up pretty well up to about episode 12-13. From there things do go downhill some. The story shifts focus to the main mystery & in all seriousness I was not all that interested about that whole situation & they could have gotten the explanations over with in 20 minutes, if they really wanted to. From this show I wanted wholesomeness and warmth, but we got some real Melo in episodes 14-15 and I did not feel the emotional impact all that much, nor did things get resolved in a satisfactory ending in the final episode. Make no mistake episode 16 was pretty nice, but it led to the kind of mildly hopeful unending that I don't particularly like. It's possible that the subtitles contributed too, the last sentence that EunSop said slowly over the course of the last 3 minutes felt strange..(VIU) Also I'm curious about how the original novel ended, I have a suspicion that it was not like this.
The low rewatch score is the result of the ending, I don't like rewatching shows that don't offer a reasonable closure.