This is the first review I've written because I find the high rating (7.9 currently) puzzling.
Compared to other dramas of similar rating, I must say this is not on the same level.

I'm fan of the leads, so I'm watching the drama because of them. Unlike other comments, I find the acting more than acceptable (but I haven't read the novel, so I can't say if the characterization matches that in the novel). They are cute individually, but I also agree the chemistry is lacking - despite the cinematographer's efforts into building romantic picturesque scene that's just classically gorgeous (particularly those scene in those last episodes - you know the ones. yum.)

Except those few scenes at the end, the special effect was also horrible in the sense that it pulls you out of the story. The "inner force" is all just fan and wind, and the power feels a bit hallow on screen. The line trap that's virtually invisible is thick as a rope at times, and can just be cut through or repositioned if you're a character that needs to stay alive. It is impossibly deadly if you're a bad guy. The green screen effect and prop so obvious that again it looks more like a school project than a professional production. The editing is choppy. The exact same line repeated in consecutive scenes (as if they filmed it, and didn't know how which they want to use and decided to include both).

The fights themselves are not the most interesting choreography I've seen, and we've all seen these actors execute better fight scenes in other dramas. Every c-drama fight is a dance, but it's like watching a professional dancer dance or watching an elementary school production. The steps are simple - suggestive of a fight more than seeing and feeling it. For a show billing itself as a wuxia, the "wu" (meaning fight) element is surprisingly weak. This got worse in later episodes, where they skip the fight entirely. There is a scene where the character picks up their knifes indicating they are going to fight. The next scene is the bad guy on the ground suggesting there was a fight and the bad guy lost... which leads us to the biggest problem of this story - the writing. The political dynamics both of the court and of the martial arts world were brushed over. It leaves the viewers feeling like all the fights were just random. You're barely invested in the fights. You know good guys will win and bad guys will lose.

The drama has never set any tangible goal for any character. Zhou Fei leaves home for the sake of leaving home - no goals to speak of. Xie Yun's goal is achieved by the end of the first episodes, the rest of the time he's just wanting to live his life. Now, wanting to live his life has been the plot of many leading man, if only there was someone who doesn't want him to do that. But in fact, everyone wants him to just live a normal life and do nothing. So, yeah, our leading man is someone who's entire arc rests on do nothing. One could then say his arc is to support Zhou Fei, but Zhou Fei's arc seems to be supporting Xie Yun. So, again, circling around nothing...

Side characters are largely one-dimensional, and again lacks purposes. So often, I feel like why is that character in that scene? She has no skills and therefore no reasons to join this "mission". Eventually I concluded the actress needs screen time. So, even though there is absolutely no reasons for character x or y to be there, the script put them there because that's where the action is. The acting for some were flat - furthering my feeling of "huh?"

Low music scores because as the show progress, I find the music montages as just a way to fill time. Later episode also had very modern sounding music that pulls me out. I thought I was watching a James Bond movie...

I'm writing this review because I use this site to evaluate what drama to watch - and 51 ep is not a small amount of time. So, if you are fan of the leads, go for it. The plot is simple enough that you can watch it easily in 2x without issues. Honestly, this is a fine show if it wasn't for higher expectations. Had this been a show with no names, no supposedly good source material, and released without fanfare, it would have been just another average c-drama in the sea of internet dramas with rushed script and low production. Some reviews say this is their favorite drama of 2021, I suspect it's only because we're in January...