System: Boss, Put the Knife Away!

Looking for a Calm Protagonist With Real Abilities, Not Someone Who Relies on Cheats

I Watched Catching the Wind, Chasing Shadows. Any Similar Novels? I Really Want to Read One

For example, the protagonist could be a retired officer who returns to the field, or a rising newcomer. Stories with or without cheat abilities are fine. I want crime-solving, not supernatural mysteries, and I want to read about the battle of wits between the police and fugitives.

Infinite-Flow, Mystery, Horror, and Instance Dungeons, With a Smart Protagonist

Looking for books like *Starting with a Game, Slaughtering My Way Through Another World*.