You know, this is the Japanese National Civil Service Examination, Class 1, which only a very small number of people can pass.,The dormitory provides free water and electricity, and there is also a delicious and abundant free cafeteria, which means it offers both food and lodging.,PS: A 22-year-old detective is possible, the protagonist's birthday is set later, so he is still 22 after graduation, besides, that's how twisted the occupation group is.。