The biggest problem is that the Serious Crime Investigation Agency has become an ecosystem for former prosecutors

Starting from the head of the Serious Crime Investigation Agency, all high-ranking officials at grades 2 to 4 are former prosecutors.
The reason given is that they "are good at investigating."
If that is the case, it means that the 2nd and 3rd heads of the agency will also be brought in from the Prosecution Service (Prosecution Office),
and that former prosecutors within the grades 2 to 4 will continue to be promoted,
and whenever a vacancy for a former prosecutor occurs within those grades, they will be brought in from the Prosecution Service (Prosecution Office) again.
Furthermore, the Serious Crime Investigation Agency can handle all lucrative criminal investigations right from the start of the investigation.
This is why I am saying it would be better to just go back to the Moon Jae-in administration era.