Mediocre.
-Nonsensical title and kinda misleading poster.
-The plot was too dragged out, I'd say about 6 episodes too many.
-The plot was mostly about politics and full of beaten to death cliche tropes seen in practically every saeguk out there, nothing fresh. If you can't write a captivating period drama story then go fantasy, or at least throw some zombies into the mix to spice things up!
-A very slow burn romance and lack of romantic chemistry between the main leads.
-Misrepresentation of FL's character. She was presented as a fighter and genius detective in the beginning, but then was degraded into a passive sidekick to ML, who along with another male detective character basically solved all the mysteries. They took inspiration from the og novel, but def no wheels were reinvented here.
-SML was so boring and lacking presence compared to ML, FL didn't even give him a good second look after meeting ML. I guess no one was having second lead syndromes here.
-Some ridiculous bs about the immortal fish and queen's rise to power, don't even want to go there further.
-Obligatory and as always unnecessary time skip and rushed ending! This just triggers me all the time in kdramas. ML wasted 10 minutes of the last episode literally digging holes. Should have showed more scenes about what happened to everybody in the end, most of the stuff was just alluded to or announced and then it was the end.

Secondary couple was the only highlight, they were funny and cute together all the time. So i guess 6.5 overall from me.