This drama is romance-main (based on a romance-historical novel), so don't get disappointed when the romance scenes are everywhere.

Pros:
- Kim So Hyun. She's young, but she's actually a veteran actress. Her crying scenes are the best lol.
- The production is insane, the castles, battlefield, properties, everything.
- Even though it's more political than action-spree, the plot is easy to understand.
- Heroic female. (This is a unique plot from SK drama since SK's society is much more patriarchal which prevents women from doing/leading actions)
- Ga Jin's character development is smooth. She doesn't get weaker even after quitting Cheonjubang assassin team.
- Second lead's romance lines are worth watching.
- You might get a little understanding of what is Goguryeo, Silla, and Baekje, though the drama is a fictional work and not based on true history.
- Again, the female characters did large contributions to the plot. One of them is Mo Young, love her character so much <3

Cons:
- Even though the female characters are heroic, but the writer still portrays them as emotional beings. It's weird when the top global assassin from Cheonjubang is easy to shed tears emotionally haha.
- Uh, the last episode ruins the ending. I think it's better to watch it not until the very end.
- Ga Jin's story with the assassin team is too short, we need to watch her action as the assassin.