MIW is a new leader of the faceless that rose to power in the last 5 years. Qing is old enough to be able to kill YM's parents and to become a new leader in the last 5 years leading up to current events. None said that the old leader of faceless was the one that killed them personally. So age isn't an issue.

Height wise they are the same. There were a few hero shots earlier so MIW looked taller. But Qing is about the same height as Yuchi,Yuchi is at shoulder height to MIW's assistant and MiW is at about shoulder height to his assistant as well.

Hair is the only thing that makes little sense. But it can only be the crew f'up.

 Enigma05:

I mean, what if MIW is a chick with a voice changer?

Yeah we haven't seen his mother for a long time. now that would be hell of a twist.

 Enigma05:

So you think he switches out wigs very quickly but what about the fact that he’s so short and the body build is a bit different? We could chuck it off as we don’t know his age or his origins. I guess we will have to see when they do the reveal because I’m leaning towards him as well, but there’s still a lot of inconsistencies.

That’s the part that’s fun though and then you have to think about what is his real motive and who is he? Where is he from? I wonder if they’re going to let that cat out of the bag in the last episode or before hand. But I do like the fact of how tightly they are keeping who he is a secret. Because more often than not, the real villain is known to the audience from nearly episode one. 

i personally have these suspects in mind:

1. shen bai lian

2. duomi, only bcs he’s sus (and someone said he was one of the casts that went to the promo for hi6, so it’s kinda sus for a supposedly guest role to go to hi6 with main casts)

If the writers take an obvious route MIW will probably be Qinger (looking at the ears, high probabilty). If they choose the betrayal route it will probably be Shen (just because he's been suspicious). It will probably be some unknown character if it's not either. (least possible). 

Yeah that’s a weird one.