Han Jeong-hyeon hides his identity from his wife, the Chief Corruption Officer, and struggles to protect his beloved wife and child.
While uprisings against the government to deter injustice, Choi Eun Soo and Han Jung Hyun are detained together by the security forces after a demonstration. Later Han helps Choi and her friends escape.
Han Jong Hyun changes his identity for an official intelligence mission, and he holds this change, and marries Choi Yeon Soo without her knowledge that he is Lee Seok Gyu.
Do Young-gyeol reappears in Han Jong-hyun's life and threatens him that he will reveal the truth to his wife.
A message arrives to Choi Yeon Soo from Cha Min Ho who sent it before getting killed, informing her that he left her an envelope containing important information.
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Do Yong Gyul threatens Han Jung Hyun to harm him and his family unless he handed him the envelope with all what it contains.
Han Jung Hyun goes to the crime scene where Cha Min Ho was killed and sees Go Yeon Joo at the crime scene and chases after her and they meet after a fight.
Choi Yeon-soo takes over as CIO's manager and Do Young-gyeol enters LCIO as the security official to spy on what's going on within the department for Im Hyung Rak.
Detective Jung Hyun follows up on the location of the sender of the reports and videos of the LCIO administration.
Do Young Gyul kidnaps opponent Ah Sun to embarrass Choi Yeon-soo in front of the press and the accountability board, but Han Jong-hyun has another plan.
Han Jong-hyun draws Choi Yoon-so's attention to Doo Yong Gyool's truth and asks Bae to investigate him to reveal his truth
Han Jong Hyun goes to the CIO and enters Choi Yeon Soo's room after taking her access card, He exposed the spy cameras and left a clue for Choi and the rest of the members.
Hyung Rak sends his men to the CIO to take evidence in coordination with Cho Dong Wook. However, Cho Dong Woo lets Hyung Rak down. Later, the collectors and the CIO members, have a quarrel.
Choi gives the order to arrest Chief Prosecutor Kwak on charges of perverting justice and perverting evidence. Later, Hong is arrested for murder.
Hong escapes from the police and tries to keep Do Young Seol away from his wife. Meanwhile, Choi opens Sergeant Won Bok Sung's case file with Kwak.
Choi pays Kim Jong Ji's daughter a visit and asks her to help her to reveal the truth. Later, Choi Dong Woo decides to help Choi and presents her with Chamin's case file
Chaoi receives an email by anonymous that includes photos and reports prove that Park Do Sik is not the real killer in the Kim Tae Yeol case.
On the day of Park's death, an important matter was discovered by Jung on Mr. Goo's computer. Han Jong Hyun confesses to Choi that his real name is Lee Seok Gyu.
Choi collapses after Jung confesses to her about his real Identity and asks for divorce, Choi is informed that Young had hacked her computer
Choi discoverd that General Manager Im Hyung Rak is the one who gives the information to Park, and that Park Jung sent a diplomatic bag to Italy and then took Im Hyung Rak from the airport.
Park is informed that he's not allowed to leave the country, and that he should better turn himself in.
Choi goes to meet the ex-intelligence agent who informed her about the appearant of Hyun Rak in the photos, and that he is the actual killer.
Park Hoon Joong is found murdered in Nahrhan, someone was attempting to convince everyone that the accident was a suicide.
Principal Choi was replaced by Cho Dong Doo after being terminated for abusing her position of authority.
Han Jung Hyun secretly enters the general manager's office and finds the tablet. Later Im Hyung Rak kidnapped Choi.
Bargaining Choi to cover up the information on the tablet under the pretext of the country's security.