My biggest issue with Kdramas is that they tend to get complicated for the sake of being complicated and there's a lot of them that are like that. This one, is not one of them.

Is the story original? No. Does it have to be? No. You get what you expect when you read the synopsis and everything stays in its lane which is very, VERY rare for a Kdrama. You expect a medical, bromance drama with a touch of supernatural and that's exactly what you get. There's a bit of romance but it only adds a bit of flare to the characters and story and it stays in its lane and does not take over which I find that WAY to many does, which is why I tend to stay away from anything that hints about romance in the synopsis.

The story ties itself up nicely and there's pretty much only one thing that I felt was a bit left out, a character that leaves in the early, middle-ish part of the story. I felt like he should've been there to tie some things up but never shows up again. Though it is possible that the character added some character development to the main characters that wouldn't have happened otherwise that I never realised. This is only a minor detail though.

Now the acting was great as usual. Rain and Kim Bum did great as the main characters and their chemistry with each other made the show. I've seen a lot of people complain about Uee and saying that they don't like her acting. I haven't seen her in anything else so I can't speak of her other stuff but here I thought she was fine, so I'm just gonna put that complaining to the usual hate I see pretty much every female lead/actress get because they are the female lead and the male lead is "so hot" and can't do anything wrong.

I also saw some stuff about Son Na Euns character. Not really anything about her acting but rather that her character didn't feel like main, which I kind of agree with. Amongst the "mains" she had the least impact on the show but she definitely was an important support character and I don't agree with the comments that the character is useless and doesn't do anything.
Of course we can't forget about the veterans such as Sung Dong Il and Tae In Ho which you'll see in like every other drama, doing what they do best as usual.

The music is not bad, just that the last couple of dramas I've seen has had amazing soundtrack and these ones didn't really hit me in the same way.

All in all, It's been awhile since I've followed a Kdrama from start to finish without any breaks which in my opinion speaks for itself. This is a great watch, that all I can say.