In the parking lot, the beggar witnessed a self-immolation incident, and the drug dealer was burned into ashes by the raging green light in his car.The police immediately blocked the scene. The middle-aged police officer Shang Ji (played by Song Kanghao), who was unsatisfied in his career, was just transferred to the criminal police team Eun-young (played by Li Na-young) to jointly take over the case.After an autopsy, Shangji found that the deceased's belt buckle was hidden, and before the accident, the deceased was bitten by a fierce dog.Shangji and Eun-young followed the clues and found a criminal group that forced underage girls to engage in prostitution and drug trafficking.However, during the investigation, Shangji, who was eager to make a contribution, did not report to his leaders or share the case with his colleagues.At the same time, his partner Eun-young has to endure being humiliated by other seniors.After the incident, the fierce dog continued to hurt people, and the standards were accurate, and he was killed in one blow. After the media exaggerated the case, the case attracted high-level attention. Enying ignored Shangji's obstruction and went all out to follow the clues of the dog trainer, gradually approaching the truth. However, the threat of death also followed... The film is adapted from the novel "Frozen Canine Teeth" by Japanese female novelist Nori Nanao won the Japanese Naoki Award.