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Adapted from the manga series "Nobunaga Miman" (信長未満—転生光秀が倒せない—) by Hashimoto Taiga (橋元大河).

“Angelic” rookie police officer Makita Hikari can only believe people. She was assigned to the Tokyo Metropolitan Police Department’s First Investigative Division as part of a test case of the government’s policy for the social advancement of women. However, she kept making mistakes and could not achieve results because of her innocence, and was placed in the unimportant Unsolved Cases Documentation Unit one year ago. One day, a mysterious man shows up in front of Hikari. He is the “devilish” genius lawyer Chajima Ryunosuke. Chajima believes in no one. He tells her that he has been hired on contract and assigned to the unit. Furthermore, he will be responsible for reinvestigating unsolved cases as the Unsolved Cases Anonymous Investigation Section. Hikari is dumbfounded by the sudden turn of events. However, Chajima pays no heed and drags her out to re-examine the case of a club hostess who was stabbed to death one year ago. This was a case that Hikari was in charge of during her time at the First Investigative Division. A political analyst, who had an affair with the victim, emerged as a suspect. But the case was not solved because he disappeared. Hikari and Chajima form an odd partnership to crack unsolved cases using plea bargaining with absolute secrecy.

Two elite National Security System (NSS) agents, Hyeong-Jun (Lee Byung-Hun) and Sa-Woo (Jeong Jun-Ho), who were sworn blood brothers, both fall for fellow agent Seung-Hee (Kim Tae-Hee). Sa-Woo attempts to suppress his feelings for Seung-Hee and wishes the couple the best. Hyeon-Jun is then sent off on a solo mission to Hungary. In Hungary, Hyeon-jun accomplishes his mission and while in escape mode becomes wounded. Shortly later, Hyeon-jun finds out that he was betrayed by fellow agent Sa-woo. Seung-Hee attempts to help Hyeon-Jun escape, but a car explosion separates the two and both are misled to believe that the other person are dead. Hyeon-Jun is then saved by an unknown voice and learns of the secret society "IRIS". One year later, Hyeon-Jun returns to Korea to seek revenge. During this time, the two Koreas are set to reunify, while the group "IRIS" are intent on stopping the reunification.

About small time gangster Asakichis chaotic life in the 1930s. His gambling addiction means that he must not continue working in the family business. Instead He supports himself on arranging cockfights. He becomes ex-geisha Okinus patron and lover, and goes directly into disfavor with the Yakuza.