I started watching TVB's DGSD 1997 recently and I got confused. I thought Duan Yu obtained the 6MSJ manual through the underwater cavern. But in the series 6MSJ is the Duan family's skill (along with 1YZ). So what is the real origin of 6MSJ? And if 6MSJ really is the skill of the Duan's why did some monks know it? And why did Emperor Baoding become a monk?