I think I have never adored a tv show so much for so many side characters. Grandma of the FL is a pearl. The actress is amazing, kudos to her. The emperor is the best I have ever seen so far. I like how refreshing the dynamic between the empress and the concubine was. The father is also something memorable as well as the two guards of the ML.
I really liked the concept and an attempt to make sort of a dream team but the FL character was irritating - childish and impulsive which totally destroyed the overall impression of the show.