I remember watching this some years ago and as a very big long time fan of Kdrama, I know for a fact that this Kdrama is one of the best historical drama that was released in 2016.
I also like the original soundtracks used in the song. They were genuinely captivating.
I'm glad you also enjoyed this show.
Thank you @kenechukwu97 for your comment, yes it is a spectacular series loaded with a lot of emotion in all its chapters.