Starts off with a modern case by case outlook in a historical period. The cases and situations are random, interesting, painful with quite satisfactory endings. There's a bigger thread that connects it all though. This becomes clear within first 2 eps, so not that much a spoiler. This thread paves way for some twists, a love triangle and revenge. And the last few eps completely deal with this part instead of the case by case style.
Cons first, not thorough or well covered story for a drama dealing with law and injustice and righteous causes. Gaps within cases and overall thread with how they took certain arcs, also had huge gaps or should I say, they tried so hard to keep things focused on ML who is not technically part of the royal fight, that they completely made it seem like there was only one person with brains in all of the royal court, which is the villain. And some of the build up expectations for certain scenes didn't seem to live up to it. Also, romance.
Pros. Woo Do Hwan is a one man show which is a delight to watch. Whether he's sad, angry, playful, happy or anything really. It's just so nice to watch for some reason. Cast is good. So acting and performance is all good. Dunno anything technical about cinematography but it certainly felt pretty to watch. WDH's relationship with everyone else in the drama is also fun to watch. His best friend, the FL, the SML and the supporting casts. Also his clients.

Overall, drama = 8 + WDH = 8.5