All the cast members of Prime Minister & I, which included Yoona, Lee Bum Soo, Yoon Si Yoon and Ryu Jin. They will be filming Happy Together 3.


They will be filming on the 23rd of November. As be informed by one of the KBS staff members, this episode will be broadcasted in the beginning of December.

Source: MyDaily
Translation: totoropie@TheSoneSource