Who will be the female lead in IRIS 2?

Earlier today, it was revealed that actors Jung Woo Sung and Cha Seung Won had officially signed on to the sequel of the 2009 hit spy drama IRIS. And although it'll be a long time before it airs, the buzz surrounding the lead female role is already going crazy among fans. Although it's being referred as "IRIS 2", the official title is Athena: Goddess of War. Cha Seung Won will be the leader of terrorist group Athena while Jung Woo Sung will be playing the role opposite of him. And although it's the name of the main bad guys, fans are already speculating that due to the title, the lead female actress will have a huge impact on the storyline. So who's it gonna be? On the 3rd, the director commented, "The role for the female lead is still undecided. Both Jung Woo Sung and Cha Seung Won are tall charismatic actors so we believe that the actress must be of equal stature. We are considering this decision very carefully." The filming begins in June so the creators will have to make their decision quickly to get the ball rolling on production. Who do you guys think the female lead should be? And do you think she'll able to top last season's Kim Tae Hee?