Just two years and several more titles later, Lee So Hee and Shin Seung Chan look a lot less clone-like.
They both certainly have dark hair and two eyes, each. Apart from that I don't see it. (Plus, it looks like one of them has 'deployed front airbags').
Lee Yong Dae and the american actor John Cho Edit: I found out this very resemblance has already been posted, sorry.
Haha, thats a good one ^^^ Also I've always thought that Cai Yun looked like Jacky Cheung and Fu Hai Feng looked like Aaron Kwok!