inks that it was an accident, but dog bite marks discovered on the body lead him to believe that someone had terrorized and murdered the victim. He and Eun-yeong investigate the source of the drugs found in the body and discover the victim had been pimping out young girls. At the same time, another murder involving a wolf-dog crossbreed occurs The two cases are labeled serial killings. With a connection between the victims uncovered, Sang-gil and Eun-yeong track down a potential witness. While questioning her, one of the mysterious dogs strikes out of the blue, killing the witness and stunning the cops.

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