Character Arc
Hwang Si-mok is a prosecutor whose childhood brain surgery, performed to relieve an unbearable sensitivity to sound, left him with a blunted capacity to feel emotion. The result is a man of formidable logic and almost total objectivity, qualities that make him an exceptional investigator but a difficult colleague in an office that runs on relationships and favors. When a murder surfaces evidence of a corrupt sponsorship network within the prosecution, Si-mok takes the case precisely because he is harder to compromise than those around him.
Across the first season his detachment becomes both weapon and vulnerability. He pursues the truth without regard for hierarchy, alienating powerful figures while slowly earning the trust of detective Han Yeo-jin, whose warmth offers a counterpoint to his analytical reserve. Their partnership lets him read situations he cannot feel his way through, and the investigation gradually forces him to confront how his condition shapes the way others see him.
In the second season Si-mok is drawn into the fraught dispute over investigative authority between the prosecution and the police. The arc deepens his role from lone truth-seeker to a figure navigating institutional politics, testing whether his uncompromising integrity can survive a system designed to absorb it. He remains the moral center of the series, valued less for charisma than for an unwavering insistence on the facts.