This drama doesn't have complicated plot with bunch of plot twists, everything you see is at it is. I pretty much figured the whole story line after episode 3. However I didn't enjoy the drama any less because of that. I actually liked how straightforward it was. Each concerns of the guest characters were quite simple however very relatable and they also managed to create a connection of those stories onto our main characters.
In dramas I often see a large amount of characters being introduced but then end up doing nothing for the story. This drama deserves an applause for actually being able to do the opposite. Every character had a purpose and were somehow connected to each other so it made sense why they were introduced into the story. The actors and actresses have done a good job portraying their characters, Yook Sungjae has once again proven that there are idols who can act.
Some may have complained that this drama was too short as it had only 12 drama, but personally for me I thought it is the perfect amount of episodes. The drama didn't feel too draggy or too short. In the end everything has been explained and there are no remaining questions. Overall this drama is pretty lighthearted and doesn't deal with any heavy topics. It is just a story about love and misunderstandings. It is a very well executed drama. I highly recommend this drama to the beginner viewers.

PS. Special mention for production and special effect team. It is admirable how they have managed to incorporated special effects into this drama without making it look tacky like some of other fantasy dramas. I have read that they have spent 6 months working on the the sacred tree scene (kudos to them). I have especially enjoyed the fighting scenes.