Quite surprised about the negative reviews but I guess it is to be expected. There is no makjang and it is hard to keep the average k drama fan interested when there is no hijinks
Full disclosure: I have been waiting 5 years to watch Seo Hyun Jin in a lead role since Mr Oh isComing( I probably will get that subbed myself)
Back to the story, a lot of retconned were used which I didn't exactly like but apart from that it was simply refreshing.
Kim Jae Wook is very popular from comments on the drama, but I am never a fan of a  daddy long legs character. His character took a bad turn but I guess that is realistic, humans are self-serving.
I loved how this story defined love: do you love the heart of the person? Do you love the person the way they are and dont try to change them?
Do you wait for your significant other or do you run to them?
I enjoyed how the hypocritical nature of humans was addressed. Humans are fickle, and that fickleness makes us perfectly flawed
On the second female lead's romance.. that was the usual fare and disappointing. It reminds me of stories in which an ugly girl has to be changed into a pretty girl by the male lead. An antithesis of the main couple. The Kazuya and Aya Omasa drama comes to mind... (Yamato Nadeshiko Shichi Henge)
It is a story for grown-ups and quite laid back
 I liked how business and writing worlds were portrayed
There is no gift without strings attached.
If you want something different you will enjoy this
And the male lead striking resemblance to the actor from Tomorrow With you is shocking