As a teen, prosecutor Hwang Shi Mok received surgical treatment for his abnormally developed brain, but the procedure left behind serious side effects.

The convict's strong plea for his innocence prompts Shi Mok to review the CCTV clip. At the Yongsan police station, he runs into officer Han Yeo Jin.

Shi Mok volunteers to appear on live national TV to discuss Kang Jin Sup. He also makes a bold promise to find the culprit within two months.