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Out of Japan's 220,000 police officers, only 500 are professional investigators. This comparison alone shows the difficulty of passing such an exam.,But good times don't last forever. In the following year, the Japanese economy took a sharp downturn, and as a result, the Tang family's hot spring inn became increasingly difficult to run.,Apart from the aforementioned salary, if a police officer is unmarried, the Metropolitan Police Department requires them to reside in the designated single dormitory.。