I think this drama just stole the first place in my favorites list! I laughed, I cried, it moved me Bob! Go watch this amazing drama now! Stop reading! Honestly, this is the highest quality drama I have ever seen. Not just the best, but the cinematography, the sets, the costumes, yes EVEN the Visual Effects were magnificently amazing. I didn't have to cringe my way through a scene that looked fake! No, instead I would be thinking "Wow, what amazing camerawork, what an ingenious way to show that, look at that scenery!..." etc, etc, etc.

Story (10.0):
I have yet to give a 10 across the board, and rating the story a 10 is almost as rare. This story is literally gobsmackingly amazing! If you need some context, it reminded me of a mix of some of my other favorite dramas: Healer just for the vibe of secrets and connections to be found; Queen In Hyun's Man for the previous lifetime, man from another time sort of story with an impossible love; Legend of the Blue Sea with similar feels of previous lifetimes and fated character connections, touches of supernatural. But honestly, it was also completely its own thing. It reminded me of elements from those other dramas, but took those and transcended them!
Goblin was the perfect mix of romance and bromance, comedy and tragedy, love and heartbreak, life and death... This drama had way more than I asked of it and didn't ever once go off the rails. I won't spoil the ending or anything, but at the end of the drama I had SO MUCH FEELS I felt like I'd just watched a 50 episode Saeguk instead of a measly 16 episode package of awesomeness!
I've heard some complaints about the lead female roles characters, but honestly what really made me love this story and made it stick out from all the other dramas I've seen was the characters and the interaction between the characters, the ways they try to express their feelings and learn from those around them, the witty banter and dialogue! I can't say how many times I laughed in this drama! I think episode 10 was my favorite just from this one hilarious bromance scene... AHHH! I want to write more about this story because it was pure GENIUS, but I can't say much more without giving some spoilers. Read the plot if you--never mind just go watch this.

Acting/Cast (10.0):
Perfection. I can't say I've finished anything Gong Yoo has been in and I honestly couldn't deal with Cheese in the Trap; nor have I watched much with Lee Dong Wook... BUT THEY WERE AMAZING. All those main three... I seriously can't deal with it. The story and dialogue was my favorite part between these three and they delivered the heck out of this. The bromance between Gong Yoo and Lee Dong Wook was just the best. And I'm not forgetting the just as brilliant performances of Yoo In Na and Yook Sung Jae, on the contrary, I've seen these two in other dramas, most notably Queen In Hyun's Man and School 2015, and I loved them both there! How could I not like them here! I was always so sad to see Yoo In Na in the "evil" roles like in Secret Garden and You Who Came From the Stars, so it's a pleasure again to be rooting for her.
I mentioned I couldn't get through Cheese in the Trap, but it was nothing to do with Kim Go Eun. Seriously, she was perfect for this role and acted it out splendidly. At first I was wary of the romance between her and Gong Yoo, and while they aren't my favorite couple out there, they really did a great job together! It was just great.
As far as secondary actors go, I don't remember one bad actor... If I remember right, there may have been some of that classic KDrama cheesy English, but no biggie for everything else we get out of this show! Oh, props for Kim So Hyun! One of my favorite Actresses, I was so overjoyed to see her in this and she looks great in a historical setting! I'm so enjoying seeing her in Ruler: Master of the Mask after her role here in Goblin.

Music (9.5):
I really wanted to give this 10 all the way across the board and honestly this soundtrack is really good! I even listen to it on its own which I don't do unless I really enjoy a soundtrack. But it wasn't perfect for me as some of the songs didn't really fit with me. But I still gave it the highest possible rating I could without hitting that ten mark!

Rewatch Value (10.0):
Yes, a 10. Usually my rewatch values match pretty closely to the story value, and this is no exception. The story is just amazing especially the first time through when you don't know what's going to happen, but the interactions of the characters is just such a joy to watch that I've already started rewatching this! To be honest with you all, I watched the first half of this drama when it was first coming out; I loved it, but stuff happened and I never actually finished the drama... gasp! So when I was coming back to it, I was like whatever let's watch the first part again, and my rewatching hasn't stopped from there. This drama... I don't think I'll ever stop rewatching it. And I rarely rewatch anything, so yeah, it's good. Go watch it so you can rewatch it.

Overall (10.0):
How could I not give this drama a ten? The story was astounding, the acting was incredible, the music was amazing, everything was practically perfect in every way! I feel like I've said everything up above but that I still have so much more to say! I'm having trouble expressing how much I enjoyed this without posting spoilers... I'll probably be coming back to post new stuff in this review because I know I have more to say about this but it's all fled my mind to be replaced with the desire to go watch this again. Annyeong!!! Salanghae!!! P.S. Not my longest review, only coming in at a little over 1.1k words, but it's still a great effort. Hope this convinced you to go watch this drama.