This is by far one of the best Kdrama I've watched in the years of my life. It has a unique genre covering a story between God, the devil and human. It also covers about human's greed and selfishness. It's a pity this drama seems to be underrated.

I really enjoyed the story line. The writers are great (kudos to them) for writing the ending. It gave closure to the watchers (not many drama do this nowadays). I especially love the ending as the writers gave each characters a great ending, though not happily ever after kind of ending, but it sure won't leave you to your own imagination.
I really love Igyeong's character in this drama, she was so humble, kind-hearted and unselfish girl (which doesn't really existed in reality). There are some lessons you can get from this drama (some wise advise from Harip towards the end).
A big round of applause to the actors and actresses portraying the characters perfectly. To the point of that annoying Jung Ra-in (but got used to her towards the end as the writer made her to be good). The devil's character was portrayed perfectly evil (facial expressions, etc). It was an AMAZING casts. Thank you for the hard works into this drama.

Lastly, the musics... I guess.. the phrase "Let the music heals your soul" does really apply in this drama. I love all the musics in this drama. If you really like music, go listen to it. I may not understand Koreans nor did I read the songs translations but the music itself is pleasing to the ears. Some of the songs are already embedded in my brain and can't help to hum it every time I hear the melody.

Overall... if you really like drama.. this is a must watch... this drama is superb.
Hope my review helps...