I was looking for something to watch that wouldn't require a large investment in time and wasn't too serious. This series definitely did it for me.

The hair, makeup, costumes, and sets were all great and quite different for the usual cdramas I've been watching. The OST and the background music were just perfect for the show. And I loved the little bit of animation added. Just enough to be cute but not over the top.

Honorable mention to some things that just cracked me up:
Shave and a haircut at the end of the opening song.
The FL's steampunk-looking hair and costumes.
The brother's curly locks that are so bad they look like the cowardly lion's after they get spruced up in Oz.
The dance off.
Sausage lips.
I know it's not a BL but the doctor and the brother story, especially with the sexy saxophone playing every time they shared the screen together, makes me giggle. If you want to see what I'm talking about please play the first few minutes of episode 20! OMG.
The brother and doctor in disguise as puppets with their arms locked together skipping through the enemy!
Episode 19 around the 16:40 mark - ML's tighty whities showing through his robes just cracks me up. They had to have noticed that at the time of filming, and definitely in post-production, but they kept it in for our viewing pleasure.

All in all, a fun watch that I definitely recommend. It's worth your time.