This is a very enjoyable drama about a modern woman who's an actress who meets a time travelling Joseon scholar, they fall in love and have to navigate the intricacies of his time travel as well as all the drama that takes place back in the Joseon time period.
This show packs quite an emotional punch, with one of the best on screen couples I've seen in any Kdrama (I've read reports that Yoo In Na and Ji Hyun Woo dated in real life after the show aired) this doesn't surprise me because the chemistry between these two sizzles. In addition to the sizzling chemistry let me also just say the character of Kim Boong Do may be one of the best Kdrama leading men ever written and I mean if there's a handful of best ever heroes then he's definitely on that list. he's genuine, considered, intelligent, dignified, gallant, cute, funny and mature - he's the full package.

The show is well written except for a few niggling leaps of logic which are easily ignored in my opinion. Cinematography is good, the world building is also very vibrant and high quality.
I enjoy this drama and have just watched it a second time after watching it two years ago. The resolution to the conundrum in this story was satisfying and a testament to the overall theme of remembering a true love.

The music is wonderful.
Overall 8.5 out of 10. Definitely give this show a shot, you won't regret it.