Say there is this one antagonist who is an American kung fu instructor who's become very renowned, who's full of corruption and bad to his students, but he was originally trained in his kung fu style by his own master who was a good and respectful man from China. What's a good excuse I can say how this bad instructor had first become a student of such a respectful and good kung fu master? This particular villain is supposed to be a bad kung fu teacher but his master was a good guy from China, how can I make sense of how they met and why would a good master train a bad guy who later becomes a bad teacher? I mean this bad guy doesn't really start out or show he's bad in the early years but later on he becomes full of greed and wanting fame owning his own kung fu business but uses it in a negative way. I'm sure his Chinese master would be very unpleased with this particular student he trained, so how can I connect how this master would of trained such a guy?