I would not go as far as to say I had a crush on any of them but more on the line of liking them as actors. Most people would have had at least a crush on someone by their teen years but I'm past that and I've never seen anyone I liked that much.
My list in chronological order:
Louis Koo ( ROCH 95)
Nicky Wu (Treasure Venture)
Vincent (don't remember last name but he's star of Taiwan's Dagger Lee) I remember watching him in another series that I started to like him though.
Shun Oguri (Hana Yori Dango, still like him)
Mike He (Devil Beside You, I still like him too)
Jun Matsumoto (Hana Yori Dango and Gokusen, I also like him singing La Familia) I still like this guy.
Kazuya Kamenashi (Gokusen 2, and I like him singing Kizuna one of songs in that drama) Another guy I currently like.