Episode 2 

Gong Yuan Zhi used the saber technique to hit GZY's head.

Episode 17

Dianzhu used the same saber technique to kill Yun Que.  Han Ya Si told YWS that her sister was killed by Gong  family's exclusive saber technique so she thought it was the Gongs who killed her foster sister.  A big misunderstanding.  

HYS never said YQ was killed by the Gongs.

This shows that the Qingfeng sect used to be part of the mountain crew.  

 wizinfo12:

Watching the Wangs and even SGQ fight , they don't use Qingfeng martial arts skills.

SGQ was never Dianzhu's disciple.  She lied to GSJ.  She used the claw technique which Master Yue also used to fight against YWS in Episode 15.

 wizinfo12:

Are all Wufeng assassin's trained to Qingfeng technique and skills and since Dianzhu is their leader? Or only a select few or direct disciples of Dianzhu.

Watching the Wangs and even SGQ fight , they don't use Qingfeng martial arts skills.

The missing puzzle to the series is the Wufeng arc. 

Wufeng is definitely originated from the missing Feng family of the back hill.  Something horribly went wrong which caused the family to disappear.

I think they were infected with the miasma and went mad/ evil or the infidels must have done something to the family which caused its disappearance and turned into the badass Wufeng.

So far, we have seen several common techniques used by both Wufeng and the Gongs:

1. The saber technique first seen in Episode 2

2. The claw technique first seen in Episode 2

3.  The sword technique first seen in Episode 6

YWS claimed that Zhuo Mei was her master.  

She was taken in by Wufeng to be their assassin 20 years ago for the bride selection.  

Zhuo Mei escaped the Qingfei sect 14 years ago due to the lover's injuries.   

SO, YWS lied about Zhuo Mei being saved by her father.  YWS might have been trained by Zhuo Mei when she was at Wufeng.

 ayume:

Why I feel that YWS is a direct descendant of Qingfeng sect.? As Jin Fan said, YWS fights with top secret Qingfeng techniques.

while SGQ is from Gushan sect.

GHY says he's investigated SGQ's background and found her to be a Gushan Sect descendant.  We still cannot trust her because she didn't have the baby.  She is a complicated character because no one knows if she is telling the truth or lies.

Zhou Mei is probably YWS's mother.  She gave birth to a pair of twin girls.  One was sent to the Yun family by Wufeng to be raised as their official daughter.  The other one, YWS, was raised by Zhou Mei at Wufeng.

ZH died a few years ago.  We simply do not know if YWS's story about Zhou Mei and the Yun family was true.