Every single thing!!! The visuals, the plot that literally kept me on my toes, the screen writing, everything! I think this is the only historical kdrama that I have watched till the last episode (It has a happy ending too for an added bonus). I genuinely didn’t want it to end and I kept thinking about what would happen next. This is a literal masterpiece. If you’re thinking about watching it, please do! You won’t regret it.