Seeing that this is Kim Nam Gil's comeback drama automatically made me put it down on my plan to watch list. It was really good -- at first. However, as the series continue....it started to become really boring and then later on became too cliche --definitely not something I have expected.  It was interesting how the writer tried to mix everything from Medical, time travel, historical and romantic-comedy. However, I couldn't help but think that the story got lost on what the writer really wanted to do with this story, where does she really want to focus? Does she want to focus on the medical theme of this drama? or the mystery of Heo Im's time travelling or the romance between the main leads?
At first, the story's focus was on Heo Im and YK's characters as doctors...showing us the passion for their job, their desire to treat people and all.  I see a lot of people complain on how "slow" the development is for the romance part of this series which I will definitely agree with....nearing half of the series and there's still nothing between them. Until the writer decided to cater for it, to the romance part of the story and when she did...the whole story became so cheesy, messy and lost all of the mystery and depth of the story. The slow romance development suddenly bloom in and the focus of the story became all about their romance. The rest of the problems, questions and other things about the story has been forgotten because the focus went on just to show how much these two love each other and they were being prepared to be that star-crossed lovers (not to mention, the unfair treatment that the other characters got...they were completely forgotten and ended up as nothing but "extras") and then the ending...they could've save the story with the ending but noooo they went for another cheesy one.

It's really disappointing, definitely not something I expect from KNG's work.