Earlier this month, we reported that the cast of SBS's "Heroes" paid a visit to the ROKFAF 20th Fighter Wing in support of the air force personnel. Exciting events are lined up for the airing of part two this week, as IU, Yoo In Na, and T-ara's Jiyeon will be transforming into miss A to put on a special performance for the army personnel.� The trio reportedly trained for a month in order to pull off "Bad Girl Good Girl," which received an explosive response from the audience. The '30 year old line,' comprised of Lee Jin, Shin Bong Sun, and Jung Ga Eun, performed Beyonce's "Single Ladies". During their training, the trio unfortunately received harsh criticism from Seo In Young for not being able to keep up with the difficult choreography.� Through much effort, their performance eventually earned the applause of the soldiers. Noh Sa Yeon and After School's Kahi teamed up for Son Dambi's "Queen," which they reportedly had down to a T, including everything from gestures to facial expressions. Check it all out at 6:40 PM KST on March 20th. [gallery] Source: Newsen via Nate