I will be completely honest and say outright that I watched this drama only because it started Lee Dong Wook. However, this drama is much more than just an actor I love. In fact, several of the other actors have actually done a much better job than him although to be fair, his character was not as nuanced as the others so it wasn't really his fault.
The things I liked about the show was firstly the very realistic plot in a medical drama. Being a medical student myself, it is very difficult to be able to identify with medical dramas in general because there are a lot of inaccuracies and overreactions. But this drama has stayed as close as possible to real life situations in a hospital and the struggles and dilemmas of the medical profession have been portrayed wonderfully. A very important and burning question of privatisation of healthcare has been dealt with in an interesting and realistic way. Another good thing was that they have revealed good and bad people on both sides which is exactly how it works in the world. Nothing is all black or white. That is why it seems so relatable.
However there are some things I did not like in the story plot and this is very important because I haven't found mention of this in any if the reviews. The brother of the lead is paraplegic and his story has been shown in a very depressing light. There is too much pity and sympathy from every person around him as well as a lot of self pity. One one hand it is shown he has worked very hard to overcome his challenges and on the other he is shown to be mentally completely limited by his disability. It doesn't ring true for the character.
Secondly, being a doctor myself, I found it extremely objectionable that both the doctors whose story was focussed on fell in love with people outside their profession. In one scene, LDW's character tells his mother that there is no one in the hospital to date.. all the girls are like Lee No Eul(his best friend for last 15 years) who is a pretty amazing woman actually.
However, notwithstanding a few things I didn't like in the plot, overall it is a good show. Initially it is a little slow paced but after 2 or 3 episodes, interest soon kicks in. Soundtrack is nothing special. The best thing was the acting of the cast. All have done an impeccable job.
Rewatch value is very less. Why would someone want to watch such a heavy drama twice. The most important thing about this is the story, which you will know in one watch itself. However it is a great drama for a one time watch. I came only for my favourite actor but I wasn't disappointed. Stream it.