This drama was even better than I expected.
I usually like when there is romance in a drama. There are very few times I would hate it and find it disturbing. It's just my preference. I don't like it when romance takes a long time to develop and then suddenly everything speeds up because the drama ends. So that's already one of the advantages of this drama.
Another thing I liked was the fairly quick reconciliation between the brothers. We were given hints from the beginning that they didn't completely hate each other, so it was a good choice to pursue this subplot this way.
The third thing I liked was that the creators showed from the beginning that they took a specific direction, but at the same time there were also several plot twists.
The side characters also contributed a lot to this drama. The whole thing just fit my drama taste perfectly.