Lee Woo-gyeom, the prime suspect in a series of missing persons cases, is arrested.
The victims are discovered brutally murdered, and the public condemns him as a ruthless killer. Woo-gyeom, however, denies the charges, insisting that he did not kill anyone but conducted therapeutic experiments in an effort to save patients with incurable diseases.
All lie-detection and psychological evaluations indicate no abnormalities, and it is revealed that Woo-gyeom was once a highly gifted medical student. Attorney Park Han-joon, assigned to the case, initially dismisses Woo-gyeom’s claims, but begins to doubt his own judgment after personally witnessing a terminally ill patient who miraculously recovered following Woo-gyeom’s treatment.
Woo-gyeom asserts that he can cure patients using only blood, without surgery or medication. At the same time, Han-joon’s daughter, Min-seo, suffers a rapid deterioration from an incurable illness, and Woo-gyeom’s existence becomes not merely that of a defendant, but Han-joon’s only remaining hope.
As the case gains national attention, prosecutors seize the moment to fuel public support for reinstating the death penalty, pushing the trial into a fierce battle of public opinion. Caught between the questions of whether Woo-gyeom is a murderer or a healer, the trial escalates into a controversy that begins to shake society itself.