Episode 26 Qing definitely made himself look more guilty by running after the carriage of Ah Shilun and then inexplicably all those guards were killed or wounded, except him who was conveniently just stopped with that black powder immobilization thing. So I am also leaning towards him, but keeping my options open just because we still haven't met a whole bunch of people, and there are still many unknown factors.
The hair is what gets me because MIW's hair is jet black and super long while Qing's hair is short and brown. So that's why I'm keeping my options open. I mean, what if MIW is a chick with a voice changer? We're still in a lot of realm of possibilities in guessing.