The nerd in me loves this drama in its entirety.
The cast, the directing, the production, the storyline, the screenplay and even the multitude numbers of product placements which at one point simply became amusing...
I guess; it was very expensive to keep up with the Haute Couture fashion for the entire royal crew from the Kingdom of Corea. They needed those product placements.

Although I enjoy watching it to the very end; I feel rather unsatisfied with Lee Gon and Tae Eul‘s ending. Traveling into different parallel universes and time periods are all fun and game; however, I wanted to see a royal wedding, a royal queen coronation and a stable lifestyle... So to speak...
The scientist in me understands that it is against the rules to have both Luna as a detective and Tae Eul as the crowned queen living in the same universe.
Nonetheless, the irrational romantique in me wants Lee Gon and Tae Eul to be the royal couple that rules over the kingdom.

*All in all, both the scientist and the romantique in me adored this drama.