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Here
is a list of shows that aired on the southeast asian subdivision of the disney channel, hope it helps.
I know it wasn't "American Dragon: Jake Long," since if I remember that took in New York. As far as I remember the show didn't have any of the kids transforming or anything.
And I have already checked the list for shows aired on Southeast Asian Disney Channel, but I didn't find it there.
Thanks though, guys.
Does anyone else have any other ideas?
Could it possibly be Three Delivery? It features two guys and a girl (Sid, Tobey, and Sue) and it took place in China Town. There were also several episodes with someone being transformed into some sort of creature.
A long shot, but the "two boys, one girl in China" makes me think of Avatar The Last Airbender. And the school thing makes me think of a couple of books, but not really any animated shows...

There was this show I saw three, maybe four years ago. I was staying at my aunt's house in the Philippines and I remember seeing this show on Disney Channel, or at least I think it was Disney Channel. It was about three kids, two boys and a girl. It was set in China I think, but I remember watching a couple videos on Youtube of it not in English since the show was originally from France or something.
There is one episode that sticks in my mind. I remember one of the boys was turned into something called a kwei (quei? Quei? Not sure, but I know it's pronounced like "qwey") and in the end of the episode a kiss from the girl turned him back.
Thanks in advance!