In his adolescence, prosecutor Hwang Si-mok underwent surgery to address an unusual brain development, but the procedure brought with it significant and lasting complications.

The convict’s fervent appeal for his innocence spurred Si-mok to re-examine the CCTV footage. At the Yongsan police station, he encountered Officer Han Yeo-jin.

Si-mok agreed to appear on national television, live, to speak about Kang Jin-seob. He also made a resolute pledge to identify the person responsible within a span of two months.

Whispers of Si-mok’s volatile temper circulated with alarming speed. Yet, he remained steadfast in his pursuit. He regarded his protégé, Young Eun-su, with growing suspicion.

The intricacies of the latest murder weighed on Si-mok’s mind. Seeking further insight, he went to the victim’s house, hoping to find overlooked details. Yeo-jin accompanied him, joining the investigation.

Each new discovery seemed only to lengthen the roster of potential culprits. Amidst the growing uncertainty, whispers began to circulate, questioning Si-mok’s guilt.

Si-mok and Yeo-jin joined forces for a clandestine pursuit of Seo Dong-jae. At the precipice of action, just as Dong-jae prepared to cast an object into the Han River, Yeo-jin intercepted him.

Rage consumed Yeo-jin as she processed the police treatment of Park Kyung-wan. She sought out her superior, intending to demand answers, but Si-mok intercepted her, a stark warning in his eyes about the potential repercussions.

Si-mok assembled a core team of lawyers and police officers for the specialized investigation. Their inquiry commenced with Dong-jae as the initial focus.

Driven by a growing apprehension for Ga-young’s well-being, Yeo-jin arranged for her transfer to another hospital. While speaking with a nurse, Yeo-jin learned of an unusual occurrence.

The cause of Ga-young’s seizures is finally brought to light. Chang-jun’s wife is subject to a travel prohibition. Woo-gyun implores Chang-jun for assistance in extricating himself from a difficult situation.

While exploring Kyung-wan's basement, Si-mok and Yeo-jin uncover a series of puzzling clues. Meanwhile, Dong-jae returns to Chang-jun's office to retrieve his mobile phone.

The descent from the rooftop party brought Si-mok back to a disquieting discovery. Something had been left in his bedroom by an unwelcome visitor. He immediately summoned Yeo-jin and Geon, who arrived without delay.

A sense of unease settles over Yeo-jin; she suspects a new hand in the recent killing. Simultaneously, Si-mok succumbs to a sudden weakness after departing the autopsy room.

As Si-mok questioned the suspect, Yeo-jin gathered the evidence. Many details emerged, yet the central, most pressing issue remained unresolved.

Driven by a conviction of his own, Si-mok seeks out the individual he deems responsible for the crime. In his possession lies a satchel, one whose contents will irrevocably shape the destinies of countless others.