Narcotics Cop's Monologue: Who's the Undercover? (Poppies and Roses)

The Heroine Works as an Undercover Agent and Falls in Love with a Drug Lord, but She Loves the Country from the Beginning to the End.

Undercover Police Article

Is there any story where the male or female protagonist is an undercover police officer (narcotics police are best) who has to pretend to betray the other party or the entire team for the purpose of the mission, and tortures him to death in the middle, and ends with he, please?