I'll say one thing: I generally don't like costume dramas and dramas with petty concubines. I also dislike "forced/arranged marriage that turns into real love" dramas. But I liked this one a lot, which must mean something.

The characters were very well-written. Even the minor ones had a reason to exist in the story. The story was not very original, but it was different from other similar situations because neither the ML nor the FL begged to be loved, which was refreshing. The "married without love" premise may be the center of the plot, but the story doesn't really revolve around it. The ML and FL had a life and a complete personality both before and after their wedding and they also had to solve numerous problems that weren't related to their marriage. The interations among the various household characters and their friends and enemies was well-written and believable.

There was some exaggerated acting and some exaggerated sub-plots but they didn't manage to break the show.