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Vita is a rookie genius in psychological research. Her brain works as if there were a rapid generator in it. In fact, it is a gifted talent as a snail. Upon joining the police force, she is facing the fate of getting removed due to her weak physique. Since Officer Prach is the only one that can help her, Vita tries everything to make Prach take her in as his mentee. As the captain of the Police Investigators Team (PTI), Prach is one of the few brilliant, experienced, and skilled investigators.