First of all I only gave it a 5 solely because I like the 2 main leads, otherwise I would have rated it lower.
So why did I rate it only 5.....
Lets start with the CGI...very low budget. The special effects from the fight scenes are cheesy and lacked the oomph (ex fight scenes from Love Between Fairy And Devil). Then there's the endless flashbacks of the same scenes which got boring really fast. Instead of making the viewer feel emotional, I felt the need to fast forward. Then there's the ending....it sucked. Most disappointing ending. I wont give any details for spoiler alerts but it is one of those endings that you feel like you got cheated. After investing so much time into the show and that is how it ended?
I do not recommend this show as there are many out there to better invest your time into.