The Years I Didn't Work as an Assassin

Please Recommend Some Good Assassin Novels

Something like *Black List* or *Human Weapon*. Any recommendations in that vein?

A Cold, Aloof Protagonist Who Walls Off His Heart

Any Novels About Assassins or Mercenaries?

Urban setting transitioning into fantasy.

A Handsome Male Lead Who's an Assassin, Living in Hiding on Campus

The protagonist is cold-blooded and unfeeling inside, but doesn’t show it.

The Male Lead Is an Assassin Who Helps the Police Solve Cases

Stories About Training Shadow Guards and Assassins from Childhood, No System

The Male Lead Is a Killer, and the Police Investigate the Cases

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The Protagonist Goes by Raven, an S-Rank Enforcer for the Cleaners

The Male Lead Is in the Underworld, with One Female Lead

A Cold, Stoic Young Boy, You Know?

Looking for a Story About a Retired Hitman Returning to City Life, With One Female Lead

I want to read something like *After I Retired, My Wife Brought People to Arrest Me*.

Looking for System Novels with an Assassin or Hitman Protagonist

The protagonist is an assassin who grows stronger by completing missions, has a System, builds an organization of assassins, and eventually rules the world.