KBS2TV will finally be airing their spy action thriller drama, IRIS after months of hype and anticipation. In case you didn't know, the drama boasts of a stellar cast which includes Jung Jun Ho, Kim Tae Hee, Lee Byung Hun, Kim So Yeon, Kim Seung Woo, and T.O.P. From the past teaser pictures and videos, we have come to know IRIS to be an intense drama and maybe little fun. But a day before it's actual premiere, there was a surprise after pictures of Lee Byung Hun and Jung Jun Ho in shiny costumes singing a trot song were released. They play best friends and best agents from the National Security Administration (NSS) in the drama, and were celebrating the success of a mission, singing the trot song, Unconditional by Park Sang Chul. According to a production staff, "We were really surprised by how well Lee Byung Hun and Jung Jun Ho sang the trot song. They had so much fun filming it and we hope that the viewers will enjoy it as much as we did." IRIS comprising of 20 episodes, will air on 14th October, TOMORROW!