Initially I started watching for Lee Jong Suk, who has proved as a very promising young actor. As the series progressed I noticed that the series has a very good plot overall. It has all genres, suspense, romance, action and you could easily characterize it as a 'medical drama'.
Lee Jong Suk has the main role, and he plays a prodigy doctor who was brought to North Korea when a politically strong individual tricked his father into going to North Korea to cure a politician during the war.
During the time he and his father where held captives and where used for their medical knowledge and expertise, Lee Jong Suk's character gained excellent medical abilities which he later on uses.
Destiny then starts to unfold.
I TOTALLY recommend this drama to anyone who likes what I've described.