Out of Japan's 220,000 police officers, only 500 are professional investigators. This comparison alone shows the difficulty of passing such an exam.,And the reason Tang Ze strived hard was also because of this economic downturn.,And the years don't quite add up either. It seems like Tangze in this world was born earlier than him, a whole generation ahead. I guess it's just the difference between worlds. But at least his parents are still the same.。