I have rewatched episodes from 16 to end multiple times after finishing the drama the 1st time. The first 16 episodes were too slow and the villains (evil concubine and daughter) were too annoying for me. So this is one of the few dramas where I skipped to future episodes after watching first 1-2 episodes, and then came back to watch the earlier episodes I skipped (to understand the plot better).
My favorite parts were the polo matches, FL's relationship with her grandmother, FL's relationship with her friend (wife of ML's general friend in latter episodes), scenes where FL solved problems for empress, and when FL/ML started living at their own place/FL running her own household.
Others were confused that FL appeared not to notice/understand ML's feeling for her right away. IMO, she knows how ML feels for her, but also knows that feelings can be fleeting and may not be enough for a relationship to last. She was guarding her heart so she would not be devastated if the worst happened.
I loved the interactions between the FL and ML. Sad to see that it didn't last for them in real life.