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.,During this era, because Japan had a fixed exchange rate with the US dollar of 360:1, consumption was incredibly expensive. Both meat and vegetables were very pricey.。