Veteran detective Sang-gil and beat cop Eun-yeong are in charge of a case that seems to involve a simple act of self-immolation. Sang-gil initially thinks 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.
With Sang-gil working secretly and hoping for a promotion, 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, revealing teeth marks similar to the one¡¯s on Sang-gil¡¯s body. 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. Though they don¡¯t realize it yet, integral to the case is retired police dog trainer Myeong-ho, living with his drug addict daughter and still training dogs. It¡¯s not long before the detectives find a link between the dead men, Myeong-ho, and his daughter¡¯s tragic circumstances. As it turns out, there¡¯s one more victim yet to come, part of a grand scheme of revenge that sees Sang-gil and Eun-yeong tracking one of Myeong-ho¡¯s killer dogs as it strives to complete its mission.
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