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There are no absolutely perfect cases in this world, only clues that have not yet been found! Ye Feiyu, who graduated from high school, went from the countryside to the city to help his father with his work. After that, he encountered various cases. With his clever mind since childhood, he continued to solve various strange cases. He also met his cousin Luo Xiaoying, who also likes reasoning, and solved unsolved cases along the way. On the way, he accidentally got involved in the confrontation of the "Death" organization, and also learned about his father's other identity - the KF Alliance Bureau! Let's take a look at the competition between skills, brains, etc...