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20 Episodes 2013 - 2013
Episode 1
Three years after the assassination of Hyun-Jun, IRIS is attempting to break Baek San out of NSS prison. The NSS assigns it's new recruits to guard Baek San.

Episode 2
Baek San informs the NSS that he believes something bad will occur during a meeting, between the North and South, in Hungary.

Episode 3
Yeon-Hwa attacks the representatives of the North and South, in Hungary, with help from Joong-Won. Now they are trying to make their escape.

Episode 4
Because of the NSS' failure in Hungary, Yoo-Gun has been suspended for one month. Hyun-Woo is sent to Cambodia to capture Joong-Won.
Episode 5
Yoo-Gun plans to use Baek San as bait to figure out what IRIS wants with him and who the IRIS mole is in the NSS base. Soo-Yeon tries to recover from the effects of killing for the first time.
Episode 6
Yoo-Gun has been captured by IRIS. Soo-Yeon refuses to believe he's dead.
Episode 7
Yoo-Gun is living in Japan with amnesia. IRIS has manipulated him into working for them, as an assassin. Meanwhile, the NSS follows Park Cheol-Young to Japan, believing him to be a member of IRIS.
Episode 8
After killing Park Cheol-Yeong, Joong-Won returns to the North as a hero. The NSS prepares for an attack, from Yoo-Gun and IRIS, at the North and South reunification meeting.

Episode 9
The North and IRIS have staged a kidnapping of a Northern Representative and are blaming it on the South. Now, the NSS has 24 hours to find the terrorists or it'll be war.
Episode 10
The NSS negotiates with the North in order to hunt down IRIS, together. Yoo-Gun's memory starts to come back.
Episode 11
IRIS plans to exchange Yoo-Gun for Baek-San. But, the NSS believes that Yoo-Gun is now a member of IRIS. Soo-Yeon finds out that Baek San is really Yoo-Gun's father.
Episode 12
Yoo-Gun is relieved from the NSS and is put under house arrest. Baek San has disappeared. Joong-Won plans to return to the North.
Episode 13
Choi-Min decides to work with Yoo-Gun, secretly. Ray and Soo-Jin negotiate with the NSS, offering to hand over Mr. Black for their freedom. Yoo-Gun finally finds out that Baek-San is his father.
Episode 14
Yoo-Gun pursues Joong-Won for killing his mother. Soo-Yeon mopes over her brother's death. Beak-San reveals the location of the nuclear bombs to Choi-Min.

Episode 15
Hyeon-Kyu has discovered that the bullet piece, inside Yoo-Gun's head, may turn him into a psychotic killer. Yoo-Gun captures Yeon-Hwa. There is a new spy in the NSS.
Episode 16
The NSS interrogates Hyun-Woo and Shi-Hyuk to see which one is the spy. Cheol-Hwan returns to the NSS. Joong-Won captures Soo-Yeon and plans to use her as bait for Yoo-Gun and Baek-San.
Episode 17
With Soo-Yeon and Baek-San lost, Joong-Won turns to plan B. Yeon-Hwa joins up with Joong-Won as a spy for Yoo-Gun. Shi-Hyuk escapes NSS custody.
Episode 18
Mr. Black sets up a meeting with Joong-Won. Yoo-Gun gives Baek-San's hard drive to his allies at the NSS. Choi-Min is relieved of her position at the NSS for trying to transport the nuclear bombs to the U.S without authorization.
Episode 19
Joong-Won and his team have steal one of the nukes from the NSS' custody. Baek-San makes a deal with Mr. Black to trade his last nuke for Joong-Won.
Episode 20
Yoo-Gun and the NSS try to track down Joong-Won and the nuclear bomb.