Iris

Kim Hyeon-Jun and Jin Sa-Woo, fall for the same woman who has chosen the both of them to be new members of a secret anti-terrorist organization.

For their first assignment, Hyun Joon and Sa Woo must stop a planned assassination on the South Korean President.

After saving the President's life, Kim Hyun Joon, Choi Seung Hee, and Jin Sa Woo are granted a vacation. But Sa Woo is called back to rescue a nuclear specialist from a secret terrorist organization, while Hyun Joon and Seung Hee enjoy their getaway in Japan.

Hyun Joon is given a solo assignment to assassinate a North Korean minister. But his actions could have him become the hunted.

Hyun Joon is accused of being a spy. Now the NSS, North Korean Security, and the Hungary Police are all after him.

6-months after Hyeon Jun is believed to be dead, North Korea finds out that he is actually in Japan. Park Chul Young sends Kim Seon Hwa after him.

Seung-Hee believes that Seon-Hwa knows Hyun-Jun's whereabouts and follows her back to Japan. Meanwhile, Hyun-Jun is being hunted by Japan's National Intelligence Office.

A mysterious man has been trying to track down Hyun-Jun because of a USB drive that he received from the late Hong Seung Ryong. It turns out that the USB has information on a mysterious terrorist organization, called IRIS.

Kim Hyun-Jun asks for Park Cheol-Yeong's help in getting his revenge on the NSS for abandoning him. Cheol-Yeong will only agree if Hyun-Jun helps to plan an assassination attempt on a North Korean traitor.

Hyun-Jun and Cheol-Yeong's men set up a wild goose chase for the NSS so that they can break into NSS headquarters without being seen.

Hyun-Jun finally discovers that Seung-Hee is still alive. He escapes, with the terrorists, from NSS with a piece to a nuclear weapon. Now Hyun-Jun has gained Park Cheol-Yeong's trust.

Hyun-Jun makes contact with the secret man that saved his life in Hungary, in order to find out more about IRIS and his parents. Seong-Hee has become obsessed, once again, with finding Hyun-Jun, which is getting her in trouble with the NSS.