No System + Not a Power Fantasy + No Transmigration. Read with caution if that bothers you.
The protagonist is born into a military family and has never seen his mother.
After graduating from high school, he enters the police academy. His outstanding abilities catch the attention of his superiors, and after training and selection, he infiltrates a criminal organization.
But just as the protagonist receives his assignment, his father dies under mysterious circumstances in an apparent suicide.
While carrying out his father's wishes and infiltrating the criminal organization in Y City, he discovers that he is caught in the middle of a vast whirlpool.
“Do you know how your father died?”
“Do you want to know who your mother is?”
By chance, the protagonist discovers that his father did not take his own life. As he quietly investigates the truth, he also begins to uncover Y City's tangled web of interests and the secrets of his own past...
