I know pretty much all HSDS told me. I predict she's YG's decendent since first of all her last name is Yang. Second, she told that tomb stuff that confused ZWJ. Another part that I think Yang is YG's decendent is because she knows 9 Yin. I don't think she could have learn YG's kung fu because those are only for males. As for Pretty Girl Manual, you need a secondary person to help out, which actually may be possible, but doesn't seem so because there's no one else at her level according to the girls that all walk behind her. So I think her main kung fu is 9 Yin. If you guys really read the book well, then you'll know that Wang Zhong Yang only wrote like 20% or 30% of 9 Yin in the tomb, and those were the kung fu needed to break Pretty Girl Manual. SO technically saying Yang should only know 20 or 30%, but remember, in the the tower when the Zho Jo Ro's master told her stuff. IT said that YG created HS and DS and he was the one that put the army book and 9 Yin in them. So it could be possible that YG copied down the whole 9 Yin and passed it on. Because 20% or 30% of 9 Yin is nowhere enough to beat Zh Jo Ro and it's impossible to make her internal energy so high.