As a fan of K-Drama, especially Kim Go Eun. I totally recommend you to watch it.
I did watching while the drama was still on going, plus without any subtitle cause I can't bear to wait even a day for another episode. And tbh I've watched it over and over again.

Why I gave the story 9.5/10 is because I can't say that this kind of reincarnation is kinda happy ending or what, logically (I know I shouldn't talk about logic or something cause it's a fantasy but I have to) the Goblin (Gong Yoo) is ended up being an immortal and Eun Tak (Kim Go Eun) keep reincarnating and she only have 2 chances left in the last episode. It's painful to imagine that in the end the Goblin must live his life all alone if she has no chances left.

Anyway, I'm still LOVING this drama. It's in my favorite drama list. The casts is BOOM (I love the bromance between Gong Yoo and Lee Dong Wook, awwww they're so cute), the osts are freaking good (I know all of the song, and even remember some exact scene where the song appeared in), the cinematography, the setting, the vibe, the staffs, I love them.