People's are judging it pretty quickly. Initially I also didn't liked how the story. I thought it's gonna be classic trope of inner court family fighting drama. But now I wait for new episode everyday. The things I lked about this drama are :
1. Leads are very understanding of each other. They support each other and don't get in each other's way.
2. Fml's character is consistent. She take good decisions, like in some dramas fml's are shown smart initially but as the episode progress fml starts relying on ml, but here it is not like that.
3. Some people might find fml voice annoying. I also found it annoying at start, but now it does not bother me at all. So as the story progress you will get used to it.
4. Both leads have their unique storyline & they don't overshadow other couple.
5. Leads resolve their misunderstanding quickly.
6. There is no sml syndrome. Fl straightly draw a line with sml although there is a reason why fml does it.

Please give it a try. You may skip initial 2 episodes if you don't like concubine trope.