Watch the TV Show instead
It's based on a novel which I haven't read. I've watched both seasons of the TV show and am looking forward to the next season.
The movie is so so. It obviously can't fit in all the plot. Aside from that, virtually the entire cast is actually inferior to the TV show. The martial sister reprises her role in the movie from the TV show but everyone else is worse looking and less charismatic other than the the wife of the master.
Due to time constraints, the relationship building isn't there and where it is, it is mostly bad chemistry.
Some of the backstory is hard to grasp if you haven't got prior knowledge as they didn't convey it well. They have points included but you dunno why it is even relevant as it is never referred to again anyway.
So give this a miss and watch the TV show but it is super long.