This drama is a Priceless Gem.

I cannot say anything new about this drama probably that others haven't already said but I have to write this and express my love for this drama nevertheless.

Plot: 10.0
This is so well thought and written drama, it is unbelievable.
Every step is so brilliantly constructed, every character has its own story and motivation, you can see it all the time for all of them, good guys or villains, their motivations, desires, motives, everything is there.
What I truly love, villains are so well made that you even feel sorry for them in the end, because they were trapped in their own story and had good reasons why they did something in the way they did.
In the most of the tv shows or movies I've watched, villains are mainly bad just because... reasons, or they want to have power over others or just being brutal without even a reason, here every villain had started as a normal fine human being but with some wrong moves and intentions they were slowly going that path of evil.

*** THE SPOILERS AHEAD ***
Rarely I like watching love triangles in tv shows, but here, it is somehow created unlike any other drama I've watched, this love story is so different, I suffered and enjoyed it at the same time, so bitter sweet emotions for me.
It was so sweet to watch falling in love between XF and JM in the heavenly realm but for me favorite part was their falling in love on earth, even though I'm a male, I cried so hard, this is such a beautiful love story.

RY is a brilliantly written tragic character. His obsession is an example of what one can do if one lose the love in their soul, he so desperately wanted to be loved by somebody (JM) that he became obsessed.
His obsession became the most important thing to him, he sacrificed everything for even little bit of love or just affection, of even just to be around of JM that he overlooked her love for XF, her happiness which should be very important to him if he genuinely loved her, he overlooked his own brother's love for him, and we saw very clearly in the end that XF always loved him sincerely.
*** THE END OF THE SPOILERS ***

I could write many more about plot and what I really like but it would be too long so I stop here :)

When I watched this drama for the first time, I enjoyed the love story of support leads but when I re-watched it for the second and the third time, I skipped most of the scenes with them because I just wanted to see love story between XF and JM again and again, heartbreaking but beautiful.

Acting: 10.0
They are just great, main roles, support roles, everybody was just great, I cannot say enough praises for all of them.

Music: 10.0
Music is awesome, outstanding, I developed some kind of emotions when I hear theme songs, whenever I hear that music, I feel like I'm gonna cry, and feel some kind of warmth in my chest, music just amplified the emotions of the story by billion, by infinite :)

Re-watch: 10.0
I’ve watched it three times already and only time will tell how many more times I’ll watch it in the future.

I cannot recommend this drama enough, DEFINITELY MUST WATCH Drama.