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Lin Mo, a former detective who retired due to post-traumatic stress disorder, now serves as a criminal investigation consultant for the city bureau with his extraordinary sensory acuity and profiling ability. He has been suffering from severe asthma for a long time and needs to rely on a portable inhaler. He maintains a mutually trusting working relationship with the tough and observant criminal police captain Chen Rui. The two are working together to investigate a series of disturbing serial murders. The latest victim was a young woman whose body was found in a large cement pipe in an abandoned sewage treatment plant in the suburbs. Her internal organs were eviscerated with unusual precision and skill, showing a strong sense of ritual. The layout of the scene suggested some kind of sacrifice or confession gesture. When Lin Mo examined the body at the forensic center, he tried to profile the murderer, believing that his behavior was not motivated by anger, but more like a cold display or declaration. Proficient techniques may mean practicing many times or copying a certain pattern. The case does not exactly match previous records, suggesting there may be connections to old cases that have not been made public.