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Luo Yechu was the third daughter of Superintendent Luo's family. She was specially invited to attend Nanwan College, the best police academy in this city (the capital of City A), during her freshman year. Luo Yechu is good at reasoning (psychology, practical crime techniques), his roommate Su Yushuang is good at anatomy, Yu Ying is good at chemistry (such as extracting DNA, on-site fingerprints, footprints, hair, etc.) And his roommate Nan Nan (niece of the college principal) is good at ** (like hackers, etc., Who can obtain information from the police and steal information from the police) The four of them have repeatedly solved major cases in the city, but they are targeted by the young master of the Si family, who is also a member of the police superintendent's family...