While inside the autopsy room, both Sol and Beom start to feel sick. They both suffer from a fever, and Beom even collapses. The NFS goes to late Lee Dong Jae’s place, and Hyun finds out that Dong Jae had a sizable life insurance. Now, the cause of his death could either be due to an illness or murder. Mean-while, another secret is revealed regarding Beom's past.

殷爍有了一個新隊友。一個臭名昭著的連環殺手幾十年來第一次重新露麵，警察和檢察官展開了聯合調查。

一名新成員加入殷率的團隊。一位惡名昭彰的連環殺手在幾十年過後再度犯案，促使檢警雙方聯手偵辦。

부검실 안에 갇힌 백범의 추리로 사건은 새로운 국면을 맞게 되는데…