Basically, this drama is quite good for it's genre. It focuses on the 'revenge'. But as the drama progresses it gives insight of many other things. It has a slow romance plot and if you're looking for a romantic drama this might be not the one. Still there are moments where you feel the connection between the leads even though the romance isn't strong. Loved how they portrayed the villain part. But felt like the backstory was a little bit lacking, yet didn't feel disappointed. The concept of family also really was up to the point. And the acting of the monsters and OMG! Lee joon's acting was just amazing. Idk I was really in need of a hot villain and this was it. Music is also good.

The ending was what most people didn't like. But for me I expected the ending. Because most of the fantasy dramas-from Goblin to A Korean Odyssey had a similar type of ending. The finale of these types of drama is quite the same. And everything was neatly tied up.

But their are many cons in the drama. The ending kind of felt rushed or they just tried to fit most of the important parts to the final episode. But the ride was worth it. There are some plot holes and questions that still feels unanswered. Some of the episodes felt like filler because nothing important happened.
But overall loved how refreshing the plot is and how the leads grow on eachother. And how the drama unfolds, the mystery part is great.

This drama is NOT for everyone. Some will like it and some won't. If you're in for something refreshing and not the usual cliche's, I will totally recommend this. Go for it!