I have rewatched this twice and it each time the same issues prevent me from rating it higher.
1)The unnecessary lack of communication between characters, even within the FL’s family that the writer portrayed as close.
2)Not enough focus on the ML and FL was a missed opportunity, this one aspect prevented this from being regarded as one of KDrama’s best shows. Because if you look at some of the best all time favorites, like my love from the stars, crash landing, descendants of the sun, it’s ok not to not be okay , flower of evil, extraordinary attorney, queen of tears, alchemy, and on, and on….
Only “Slice Of Life” dramas with strong cast’s can pull off spreading out the focus.

That being said I recommend this because IU’s performance and it factor is a thing of beauty to watch.
And in my opinion this is one Yoo In Na and Jo Jung Suk’s best performances.

Also this show had the most ‘Legs’ of any show I’ve seen, I wonder if the director had a thing?