Great drama with exceptional music: OST is in my humble opinion the best of any C-drama and I've watched 40ish so far. It doesn't matter how bad or stressful work is, once i hear first few tunes of opening song i'm transferred far, far away and my troubles are gone in an instant.

Main protagonist, Sing Sing & Ning Qui play their roles very well and growth of characters and their skills is nicely done. Support actors are exceptional as well .
Story, acting, sets, costumes, CGI effects and fight choreography are all done quite well and very often you will run in to very emotional moments.
While not perfect, definitely worth the time and highly commandeered if you like this genre.