I cannot praise this highly enough, it's great. It has sci-fi, medical, saeguk intrigue and plotting, adventure and memorable characters all in one. All good-looking leads to sweeten the eye. Song Seung Heon still looks very young and handsome here considering he was in his thirties and comparing his still good but more rugged look in Black only 5 years later. The only (slight) disappointment was the Joseon ending, which left the story hanging in the air. The attempt to tidy it up through Prince Heung Soon's appearance (those who watch will know what I mean) for me was unsatisfactory. Apart from that I am really sorry to have finished it. Will almost certainly re-watch, like Black, with Song Seung Heon, one of the few I have re-watched with equal pleasure as first time round. I cannot understand the low rating on this series. Lack of good taste I assume.