Very different drama but in a good way. It reminds me a lot of graphic novel and most of the story base was told that way but it stopped 2/3 through the season.
Interesting love triangle was very nicely done but very sad and full of sorrow. Very dark including sad ending but they have to justify the title.
This is one of the rare dramas that could have at least 20 more episodes as story and some developments and facts were just...Well.. put in place. Ending was kind of rushed too.
Nevertheless, acting, camera, sets, constumes, CGI and choreography is nicely done. Even camera work shows high detail and attention to detail.

NOTE: This is my first drama with Li Yi Tong and she is a great actress but it was at the times very painful to watch. She is so skinny that throughout the season it would distract me - It would be really hard to do anything considering her bone and skin hands, never mind wielding the sword. I will definitely have to look up some drama of hers as I like her acting and unusual fiery character and voice.