Someone named bb on dramacool wrote this theory on who DZ could be:
"
1. Who is the leader of Wu Feng? Based on SQ's suspicion, Dian Zhu from the Qing Feng Sect could be the leader of Wu Feng and it's probably true.
However, we've heard two female voices, one in the earlier episodes and another in episode 17. The female leader from the first episode sounded much older than the one in episode 17. Could she have aged so much in just two years, or is it after-effects of poisoning? Or are they originally two different people?
I did a voice comparison and found that the "real" YWS mother's voice in the first episode does sound similar to the leader's voice (older version). Could it be that her mother is the leader of Wu Feng?
2. The mystery of the Feng Lineage remains unsolved, but we now know it existed before.
Wu Feng and Gong seem to share many similarities: Wu Feng's "Fortnight Poison" is actually Gong's "Heart Devouring Moon". They also share the Throat-locking technique, and YWS's Qing Feng 9 Moves Sword from the Qing Feng Sect is, in fact, the Three Forms of Wind Emission from the Feng lineage.
3. Based on these two pieces of information, can we conclude that behind the Qing Feng Sect is the Feng Lineage from Gong, and behind Wu Feng is the Qing Feng Sect?
4. Now, what is the relation between Wu Feng (a.k.a Qing Feng Sect a.k.a Feng Lineage) and the Yun Family?
If it's only because YWS betrayed Wu Feng, the leader wouldn't bother coming to her house to meet her.
There must be a big secret here.
I highly suspect that the Yun Family is the real hidden figures behind all this.
The first reason is the similarity of YWS's mother's voice, and the second reason is my belief that the use of "Feng" (Wind) and "Yun" (Cloud) in their names is not just a mere coincidence.
There are indeed idioms related to Feng and Yun, such as "云深不知处,风起空回首" (yún shēn bù zhī chù, fēng qǐ kōng huí shǒu) and "云散风轻" (yún sàn fēng qīng).
But, if YWS's mother is the leader of Wu Feng, then is she Dian Zhu? or is she Zhuo Mei?
5. Dian Zhu and Zhuo Mei's names keep appearing here and there, which makes me wonder what the secret behind them could be. They must be key figures. And let's not forget about the Gushan Sect. What secret actually connects them all?"
Isn't this a wild theory? What if it's true? Omg.