Without prosecutors, you cannot conduct special investigations or anti-corruption investigations.

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After Lee Jae-myung pushed the "complete stripping of prosecutorial investigative powers" through the National Assembly,
his remarks during the Cabinet meeting
were quite strange.
He asked something like, "Did we pass a law that prevents investigations?"
I believe even Lee Jae-myung knows that the investigative capabilities of the prosecution are useful.
It is simply the nature of the structure.
Special investigations—or even investigations in general—
are a battle of logic and legal principles.
General civil servants cannot handle them,
which is why they must be under the direction of a prosecutor.
The police are a specialized agency for public safety and initial response,
not a specialized agency for investigations from the start.