A drama about the race between people who want to get closer to the truth and those who want to cover it up. Jang Seung Jo will take on the role of Oh Ji Hyuk, an elite detective of nine years who does not share his feelings with others due to pain he experienced when he was young. He is not swayed by money and power, even with the huge wealth he inherited from his uncle.

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Sergeant Xu Dahu broke several major cases, but his independent style led to conflicts with his supervisor, Li Pengfei, and he was transferred. Dahu resigned in frustration but was encouraged by his girlfriend, Ho Yuk-kam, to start a private detective agency. While taking the police officer's exam, Ho Zi-wai became friends with Li Chang-zi, who was frequently praised and promoted. Zi-wai felt unfairly treated and eventually left his job to join Dahu's detective agency. While investigating a kidnapping case, they discovered more secrets and illegal activities involving Pengfei. They used a citizen's arrest empowered under Article 101 of the Criminal Procedure Ordinance to bring the culprit to justice.

Mishima Kanji is a reporter for the Weekly Times, which mainly deals with gossip. He feels a sense of emptiness and discomfort as he spends his days chasing celebrity scandals, without a shred of the journalistic spirit he aspired to. One day, Mishima goes to Amagasaki to pick up a certain person under the direction of chief editor Nagasawa Asuka. Nagasawa sends him off as a chance to fulfill Mishima's former wish to "see a world you wouldn't see if you lived a normal life", but what awaits him is Keijiro Kihara, a man who is now a renowned figure in all areas of the underworld, politics, and entertainment, as well as an urban legend among informers, known as "Informer".