Kim Hyun Joon is an assassin who belongs to a top secret organization known as the “NSS” whereas T.O.P is an assassin who works in another secret organization located in the United States called “IRIS” and was ordered to kill Hyun Joon. Seung Hee is a psychological analyst who plays an important role in bring Hyun Joon into the “NSS.” Jin Sa Woo is Hyun Joon’s colleague and falls in love with Seung Hee as well but keeps this to himself. Cast Lee Byung Hun as Kim Hyun Joon Kim Tae Hee as Choi Seung Hee Jung Joon Ho as Jin Sa Woo Kim Seung Woo as Park Chul Young Kim So Yun as Kim Sun Hwa T.O.P as Vick Hyun Jyu Ni as Yang Mi Jung Yoo Min as Sato Eriko Kim Young Chul as Baek San Yoon Je Moon as Park Sang Hyung Yoon Joo Sang as Oh Hyun Kyu Lee Jung Gil as Jo Myung Ho Jung Han Yong as Jung Hyung Joon Na Yoon as Hwang Tae Sung Kim Hye Jin as Yang Jung In Myung Ji Yun as Hong Soo Jin Miyama Karen as Yuki
