This is definitely one of the best xianxia dramas out there.
Story-wise, I have to say it is quite unique in a way that JM could not love and did not know what love is due to Unfeeling Pill. This set the whole story different from others. The first part was really entertaining and funny and also created a base story for every angst and drama that happened later. Characters are really well-written - RY and XF's characters complement and contrast each other. JM's character development was also quite strong - from an naive innocent girl to a woman who would do everything for her love. I particularly like RY's character arc - how he became what he was - things that he did are not justifiable but understandable, I would say. I do think that the story took a bit too long in the first arc and also wasted a lot of time in the story of demon princess and MuCi.
Acting-wise, I liked all the three main leads. YZ is one of the actresses I look forward and she did a really great job portraying different emotions. She is such a versatile actress. JM's character would not have received so much love without YZ's acting skills. LYX also did a fabulous job in portraying such a complex character, RY, - from a quiet, gentle man to a man cold with hatred. I first noticed him in My Sunshine drama but didn't know he is that good. As for DL, I have never watched his dramas. He is also a good actor; his character was just outshined by YZ's and LYX's.
If you like xianxia genre, this is definitely the one to watch. Most would compare it with TMOPB; I don't want to because these two are two different dramas apart from the fact that they are in the same genre.