Mr Sunshine is a long ride. 24 episodes long, with a massive plot, great performances and a tragic ending, this one is not one of the usual fluff k dramas. Now, I'm only a bit familiar with Korean history, so I'm not sure if this drama was historically accurate. But if you don't mind your dramas to be kind of fictional and you like to focus on the current story that you are watching, then you won't be disappointed with this drama.
However, even though the story was good and very impressive, the drama had a slow start. It felt like it was dragging on for the first half. In the second half, fortunately, it picked up. The action scenes were more plenty and the plot thickened. Kudos for the ending as well, as it was bold to conclude things like this.
Moreover, the performances were excellent from all the actors and they were many many characters in this drama, so it was harder to pull off concistant performances from all of them. One thing that bothered me though, was the constant changing of the language of the dialogues throughout the drama. But that might not bother everyone.
Finally, the costumes and settings were really good and felt original and well made. Though the soundtrack wasn't that impressive, it suited the drama's mood well enough.
So, overall, 7 out of 10.