Danbam, a sweet night. And I had many sweet nights (and days) watching this drama on a weekly basis.

The story is not ground-breaking. It is your standard David vs Goliath revenge tale, but sprinkle in characters like Park Sae Ro Yi and his immovable principles, Jo Yi Seo and her cunning brilliance, and I'm hooked.
Contrary to what is said in the show, is it not easy to be a person like Sae Ro Yi (or Yi Seo, either) and that was a lot of the appeal for me; to see a character so unfamiliar and uncommon in a world that does not favor those who don't compromise.
The development of supporting characters is also very good, especially Seung Kwon.
The romance wasn't the point of the story for me but I wasn't disappointed or confused by the result. It was also really enjoyable to see Soo Ah and Yi Seo square off time and time again.

I would definitely recommend a watch of this show and hope you can take some lessons to heart on the way.