Undercover(2011)

Undercover is a Bulgarian crime series following Martin, a boy from Sofia's suburbs who becomes the country's first undercover cop. Trained by his father to lie and deceive, Martin possesses the perfect skill set for infiltration. He's tasked with penetrating the criminal empire of a wealthy, powerful businessman, driven by his hatred of the underworld. As Martin embeds himself in the mob, he falls for Suni, the girlfriend of a dangerous gangster named Djaro—a relationship that threatens his cover. Just as he gains the mobsters' trust, Martin discovers the real threat lies within the police force itself. Isolated and cornered, he faces impossible choices while fighting to survive a mission where everyone around him could be an enemy.