It was my 1st ever Kdrama and I must say am impressed. It's definitely a must-watch. I highly recommend this drama to all who have a soft spot for a fantasy storyline with a heart-fluttering romance. Actually, the main thing I like about this drama is that it is a balanced mix of all genres :
A world with supernatural beings in it, check
Thriller storyline, check
Comedy, definitely check
Exciting romance story, check
Arrogant ML, check
FL with a special fate, check
Some horror scenes, yes
Totally unexpected, finger-crossed, suspenseful ending, check

I also liked that the story was not always revolving around the main characters, the side ones also had their background stories. In many other dramas, I have noticed that the side characters are sometimes ignored, their stories being displayed halfheartedly. But this was not the case here. They all were involved, which also added more sense to the drama. The plot can be at times messy, yes, but I guarantee you'll understand it all in the end. Fine...the ending was also not satisfying for some but I kinda ignored it as I am sincerely hoping for Season 2.

Your time is definitely worth it!!