Looks great
Your timing and drawing abilities are both impecable. I really admire how good your stick characters look when they move. I also like how you give your audience enough time to read the sub-titles during the action sequences.
I'm curious to know why you did not include sound in this movie? Are you waiting till you find proper voice actors and background musics to fit perfectly with your ideas? Or did you just decide to keep everything silent? Either way, I am able to understand everything very clearly in this flashwork, without any music or sound effects.
Your story is both very engaging and written very well. I find that all your main characters are made distinct from one another, by their dialogue and physical features. That is a mark of a pretty good writer, and I commend your efforts on this story.
All I can suggest is that you fill in your audience on why Bu killed his father and why Ju had a reason to kill Bu before the father's murder. I say this because I find that you're not telling the audience everything they need to know, so they can understand the motiviation driving Ju and Bu to fight one another.
Overall I like where this is going and I look forwards to part B