So the action in the novel develops over a long long span of time, so 1 book was written/adapted for 3 seasons (season 1= kind of an intro, season 2 = changes, character development, and season 3 = the end), it took a long time to air the 2 seasons and there were a lot of changes on the cast from one season to the other and people kind of got angry and dropped the show, putting the third season that was supposed to air in 2023 under a question mark...
The writing is good, even developing some characters in antithesis, in my opinion, the tv adaptation is good as well, capturing things well (even if it took a few years to air the second season and people did not understand the character development blaming the new actor), but with all this said there were changes in the plot and even parts that were completely omitted.
For example, in the book, the main male character is living in a modern world and ends up living and adventure in the pugilistic world remembering everything, in the series this part does not exist (they kind of changed a Xuanhuan genre to a Xianxia). Also, there is a twist in the plot in the book that was changed in the series... or more like canceled, which changed the outcome of the plot a bit.
Normally the book was not finished in the 2 seasons, season 3 should have finished it... reading the book could help one read between the lines when watching the series but also create a bit of disappointment with the changes.
I loved the action, the acting, the costumes , the character development and growth, and the soundtrack ... all in all, I loved it.