Moonlight Drawn by clouds... they have some really, really beautiful scenes in there. Coupled With that music....... wow. 

https://www.youtube.com/watch?v=7xRZLYJ7EDQ

"Moonlight Drawn by Clouds"  can't be overlooked... they have some really, really beautiful scenes in there. Coupled With that music....... wow. 

https://www.youtube.com/watch?v=7xRZLYJ7EDQ

- Tomorrow With You

- Goblin

- While You Were Sleeping (2017)

- I Need Romance 3

- Jealousy Incarnate

- Marriage Contract

- Moon Lovers

- Secret Garden

- That Winter, The Wind Blows (DEFINITELY #1)

- The Innocent Man

- The K2

- Woman Of Dignity

- W (Two Worlds)

- It's Okay, That's Love


Not really 'amazing' but captivating :

- Another Miss Oh

- Because This Is My First Life

- Cheese In The Trap


Most of these dramas are my favorites but that's mostly because my preferences tend towards good cinematography. I really enjoy dramas starring Jo Insung, he's incredible at acting.

Some I've watched and liked were already mentioned.
Recently I've watched a short japanese drama, and I was amused by the quality of it! The first episode could easily be a short movie, so well done, I was really surprised.
The name is:  Kuzu No Honkai
Although, because the drama is meant to be very instrospective, it's not really for everyone, but I do enjoyed the story too, since I like things with more depth, :)
It's short, 12 episodes of 25 minutes each, I would recommend you to give it a try, the direction was really good.

Nirvana in fire deserves a place in this discussion. 

I know this is korean drama discussion, but the best cinematography generally comes from top chinese drama due to the high budget that they have. So if cinematography is specifically what you're looking for you should check out some of the top chinese drama, there's one airing right now that takes cinematography to new heights: Tribes and Empires: Storm of Prophecy, Nirvana In Fire is really good too, just look for historical.

Tribes and Empire

Goblin, On the way to the Airport, Nirvana in Fire

And I watched a few episodes of The Advisor's Alliance, it was awesome. The feeling it brought just like when you go to watch an amazing movie. 

How about Eternal Love

I think some people misunderstood what you mean by cinematography. My advices are W,  Goblin and  Scarlet Heart Ryeo

 Burcu Karatekeli:

I think some people misunderstood what you mean by cinematography. My advices are W,  Goblin and  Scarlet Heart Ryeo

You have to take into consideration the year the drama came out and bring out dramas that had great cinematography for their period, or else we would only mention 2016/2017 dramas. That would be pointless.

https://www.youtube.com/watch?v=nxDvti9GTAw here is an example for what you meant. I don't wanna show anymore of these so as not to spoil.

https://www.youtube.com/watch?v=cDDjlX72x6g this is hd version, sorry the other one's quality was really bad.

Project S : SPIKE has absolutely AMAZING cinematography. The colors, the slow motion, everything is just beautiful. (I mean,,, just watch the trailer and I'm sure you'll see what I'm talking about.)

Second Love,  HIGH&LOW, Quartet  and Yume wo ataeru are also very beautiful to watch.