Crime/detective drama without police corruption?

come and hug me - ml is cops, his dad is serial killer

stranger - not completely corruption free but its also not just about bad guys covering their wrong deeds or good guys fighting against power and authority, plot is more complex, characters are also unique

tunnel - the villain doesnt hide behind power and authority

• Cold Eyes 
• Love Detective Sherlock K  Another kind of detective, nothing relate to police or law.
• Phantom Detective 
• The King’s Case Note