I think it's safe to say this is one of the best things I've ever seen.
I loved this drama so much.
I've never written any reviews on here before, but I think this one deserves it.

The drama has ended, but it will always be with me.
I was sceptical about the drama having only "16" episodes (there were so many stones unturned), but everything was executed well.
They gave us an excellent, satisfying ending; it has to be one of my favourites. Everything tied together perfectly at the end.
I have a lot of respect for the writer; it was their first drama, yet all the elements were perfect, and they included so much in just 16 episodes!

The characters were all complex and interesting.
I love Kim Hye Soo, and she was brilliant in this. Her character is one of the best female leads I've seen. She's strong, understanding, kind, and just the best. All of the Grand Princes were perfect; they had their flaws, but that's what made them so lovable. I adored getting to know them and their stories.
All of the characters were fantastic, including the Queen Dowager in all her evil glory (I despise her guts, but her character is admirable).

I think Under The Queen's Umbrella is severely underrated; people automatically deem it boring because it's a historical, but I have to say, I never felt bored, not even for a second.
This is one of those gems that surpasses all your expectations. (Even though I actually had a lot of expectations because I love Kim Hye Soo)
Historicals have a stereotype, one of being boring, but sometimes you need to look at the broader picture and give things a shot.

This drama is full of everything you could want: mystery, action, romance, politics, strong characters, and more!
This was a heartwarming and lovely show, and it is one I will rewatch time and time again.
Highly, highly recommended!

If it's not obvious already, I give it a 10/10.
No, scratch that; this drama deserves a 1000/10. (I still can't believe it is the writer's first drama. Everything, and I mean everything, was perfect.)