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The Criminal Investigation Section of the Haizhou City Public Security Bureau welcomes An Chenyu, a talented intern. He comes from a prestigious school and is ranked first in all majors. He is deeply involved in psychology, criminal investigation, and anatomy. He has a superior IQ, a thoughtful mind, and is good at unraveling the truth of the case from clues. Captain Ma Guoliang of the Criminal Investigation Brigade has experienced hundreds of battles, has top-notch fighting skills, acts decisively and calmly, and sits in the department to control the overall situation; Police Officer Xu Liwei is agile and capable, with full mobility, charging ahead and bravely facing dangerous situations. The talented newcomer, the iron-blooded captain, and the capable police officer join forces, and the three partners complement each other tacitly, traveling through the light and dark corners of Haizhou City, solving a series of bizarre cases and serial mysteries, clearing away layers of fog, tracing the truth of the crime, crushing the darkness with blood and perseverance, and protecting the peace and justice of the world in Haizhou City.