Haley

My additions:
1) Son Ye Jin & Han Ga In
2) Go Kyung Po & Choi Siwon
3) Kang Dong Won & Jung Joon Young
4) Shin Se Kyung & Kim So Eun
5) Jung So Min & Yoon Eun Hye
6) So Ji Sub & Yoo Seung Ho
7) Moon Geun Young & D.O. (Do Kyung Soo)
Extra:
For some reason I always thought that Park Si Yeon looked like a Korean Katherine Heigl...