Park Seonghwa.

Weekdays at the police station were always extremely busy, and almost no one ever got a break. Seonghwa had been working on a case for quite some time. A maniac had been kidnapping and killing hundreds of people in Korea for a long time, and interestingly, no one had been able to catch him for about two years. Therefore, Seonghwa, as the best police officer in Korea, was entrusted with this case a few months ago, and it wasn't like the case was progressing very well.

Sleepless nights, sorting through documents, reviewing security footage, and all alone. Seonghwa generally always worked alone, but of course, he kept in touch with his colleagues. To say it was difficult? That's an understatement.