Citizens were alarmed when reports of a serial killer in their city spread throughout South Korea. Kim Heejin, along with her partners Jay, Jake, and Sunghoon, was assigned to unravel the cases of brutal killings happening in the city. As their investigation progressed, Heejin and her team uncovered a series of leads, which pointed them towards unlikely suspects in the case. "I heard the investigators of this country are good. Now, let's put that to test. Find me. " - ongoing.