While the music here is very good ,there are many other kdramas with superb OSTS...
I've only seen 2 of those, and I only somewhat agree with flower of evil. Eternal monarch has basic ost you expect from the writer's drama. If you mean vocal osts most of them top it sure, but not without the vocals.
Looks amazing! I also think it's fine that they're adding original characters to the drama, if you look at the walking dead the fan favourite Daryl didn't even exist in the comic among others. Possibly the best of the year.