ITS NOT HIS FAMILy MEMBER!. She in the same drama as him thanks to my friend here she told me and gave me the link to prove it. So thanks to her!

http://www.allkpop.com/2012/05/super-juniors-donghae-and-actress-yoon-seung-ah-to-star-as-couple-in-new-drama 

 BYEZZZZZ XOXO

-ViVi