Great orchestral OSTs?

I'm fairly new to the k/jdrama scene and wondered if there are any shows that stand out as having great orchestral bgm?  Some of the kpop insert songs in shows are good, but too often get overused to death.  I guess I'm not the biggest fan of the overly melodramatic vocal music used in this genre lol.
So far I haven't heard anything that competes with the great orchestral composers of anime like Michiru Oshima, Masamichi, Hisaishi, Sawano, or Kanno.  

I did just start The Master's Sun, however, and so far it easily trumps every k/j drama I've seen in this arena pretty handily.

check this out Six Flying Dragons ost

I second Dana's choices - above all The Moon Embracing the Sun and Cruel City - and add:

- Warrior Baek Dong Soo - an amazing Ost where instrumental scores and songs are equally magnificent
- The King 2 Hearts - a bland of delicate, harrowing and grand with only a few songs, none of them overly dramatic

Fantastic, thanks for the recs.  As much as I recognize story and dialogue are the prime movers of cinema, I find that a good score is more and more becoming a "must have" component for a series/film to become a personal favorite.

i second princess man also faith(carry on), angry mom(i love you i'm sorry), signal (person that should leave,the road)

Queen Seondeok has a lovely orchestral OST and a minimum of k-pop. I've found that historicals generally have better instrumental music than contemporary shows. Six Flying Dragons is doing interesting things musically at the present time - I particularly like the way they've incorporated and re-imagined traditional folk songs rather than opting for a "pop" sound.

@Major 
"As much as I recognize story and dialogue are the prime movers of cinema, I find that a good score is more and more becoming a "must have" component for a series/film to become a personal favorite"

I couldn't agree more. Just lately I've created a small list of my favourite Osts and realized it looks more or less the same as that of my favourite dramas.
Unfortunately it works the other way round too: a score I don't like can easily mar my enjoyment of the show.

@amrita828 - Touché!  There have been quite a few dramas that I hoped to enjoy with all my heart, but the music choices and style (or lack thereof...) ruined them.  I also made a list on MDL so that I can make sure to track them down through iTunes/Youtube/etc :)  I've been listening to the King2Hearts OST again now that you suggested it, and I love it even more than the first time!

@major - That's exactly how I feel!  Just the other day I was watching a taiwanese romantic comedy drama, and one of the musical themes was "I Vow to Thee, My Country," and the whole time I'm thinking..."Do you even know what the piece means?"  The drama was about gender bending and had no patriotism notes at all, let alone any sort of nod to World War I or Great Britain.  I think I'm just really picky when it comes to music.  I want it to speak to me on a deep level - not say something it doesn't mean to say because they didn't spend nearly enough time on music development.  One of my biggest pet peeves too is when an actor is "playing an instrument," but they don't even put forth the effort to make it look realistic.  It detracts so much from the feel of the scene.

If only we would be so lucky as to have him back!  I love his scores, especially The Ghost and Mrs. Muir.