H (2002)

Serial killer Shin-Hyun gives himself up to police and confesses to committing a series of particularly horrifying murders of exclusively female victims. He is imprisoned and awaiting the death sentence but the killings continue, with the same characteristics of the Shin-Hyun serial killings. The case is re-opened when two more bodies are discovered, both pregnant women; one found in the city's landfill site and the other was horrifically murdered on a public bus. Detective Mi Yun (Yum Jung-Ah) and her newly-appointed partner Detective Kang (Ji Jin-Hee) are assigned to the case. Mi Yun and Kang have difficulty working with each other; their personalities and working methods constantly clash. Detective Kang goes about his new job buoyantly and enthusiastically. He follows a new suspect, Huh, and eventually catches him in the act of brutally murdering a woman in a crowded techno bar. Huh is taken into custody after Kang shoots and wounds him at the crime scene. Once again, the case seems to be solved with this spectacular arrest--yet the murders continue in copy-cat style. The police desperately hunt for new leads. They start an in-depth investigation of a Doctor Chu, who is Shin-Hyun's psychiatrist, but progress is frustrated when Dr Chu becomes a victim of the copy-cat killings herself. The murdered psychiatrist's former boyfriend, a fanatical character named Choi, quickly becomes the prime suspect. All the pieces are finally starting to fit together, and the case seems almost resolved. But all efforts are suddenly frustrated once again, when Choi takes his own life--but still, the killings continue. The case gets more complicated when even the police themselves appear to become suspects in the murders. In unraveling this mystery, everyone involved is pushed to the limits of human understanding.