The Secret Behind the Ranks of Former Busan Police Officers

There is a secret regarding the ranks of former Busan police officers.
Specifically, the secret regarding police officers who were high school graduates at that time:
1. Construction workers, taxi drivers, or daily laborers
: These are the bastards who committed human rights violations in Busan as if it were their daily bread. These types aren't accepted anywhere.
2. City bus drivers
: These are the police officers who conducted investigations with at least some level of politeness.
3. Successful business owners
: These are the police officers who conducted investigations with genuine politeness. However, even if they ran a business, there were many cases where they still didn't make it.
4. High-ranking officers at the Superintendent level or above
: They work at law firms in Busan.
There aren't many police officers who transitioned out and achieved greater success than expected.