Defense attorney who represented the victim in a hit-and-run case. His marriage to Sonja collapses due to an affair between her and the victim. He acts as the anonymous tipster, providing investigators with a threatening letter from Mila.
Kosta provides Mila's threat letter to police, acting as a key investigative ally.
Both men independently supply vital information that advances the police investigation.
Kosta and Beli operate in overlapping professional spheres tied to the victim.
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