While I felt like the series could have used more time to better show its multiple elements (everyone's characterization, the romance between Yudam and Dongbaek, Denis' overall situation and feelings, the details about the curse, etc.), I also feel that the time this series actually had wasn't used properly.
Every episode lasts about 15 minutes, yet 5 minutes are always spent for the opening sequence, a very thorough summary of the previous episode and the next one. When I say "thorough" I really mean it: I feel like one could easily just watch half the episodes (the even numbered ones) and not miss anything about the plot. The remaining 10 minutes of each episode are used showing the actual story, but the pacing is way too slow for the time an episode has: I often felt like I was watching multiple snippets of a much longer drama. I believe that they could have done a better job picking what was worth showing and what wasn't.

The only redeeming quality of this drama is the fact that Min Yudam and Seol Dongbaek make a very cute couple, one that made me sob out loud as I watched the last episode. That's the only reason why I would recommend this drama: if you're looking for a solid plotline that is properly shown, this is not for you.