With the help of a gutsy female detective, a prosecutor who has almost lost the ability to feel emotions tackles a strange murder case amid political corruption.

Hwang Shi Mok is an exemplary prosecutor who suffered from hypersensitivity to certain sounds. After undergoing a brain surgery in his youth he almost lost his sense of empathy. While investigating a strange murder case, he meets police lieutenant Han Yeo Jin, and she assists him in solving it. As they begin to unravel the mystery behind the murders, they also discover that someone guides and someone hinders their efforts to unfold the secrets about a larger scheme of corruption between the government's Public Prosecutor's Office and a private conglomerate.—Wikipedia

In the second season, an ethical dispute arises within the Prosecutor's Office and the National Police Agency, with the former wanting discretionary power over all investigative proceedings while the latter seeks for an autonomous authority. The prosecutors, including elite prosecutor Woo Tae Ha, want discretionary power over investigations. Meanwhile, the police, including Choi Bit, tries to get complete investigative authority that is independent of the prosecutor's office. In the midst of their respective agencies' conflict, Shi Mok and Yeo Jin team up to independently conduct their own investigation on a concealed case.—T