Zeinal Bandari (Jamshid Hashempur) is an opium dealer with a past criminal record. He is nabbed in a series of arrests on drug traffickers by Iranian DEA. He then In court is convicted of drug trafficking but by giving money to the corrupt judge gets lighter prison sentence and therefore after one year in prison and because of his so called "good behavior behind bars", gets a Parole and sets out free but soon he is caught again in another drug deal and once again Zeinal finds himself behind bars. This time he feels regret and realizes that his life is ruined so he accepts the offer of lieutenant Ahmad, who is the head of Iranian DEA to become an undercover agent for DEA. With the help of Zeinal they decompose the local Opium network. But the triumph is no longer sweet for Zeinal after he finds out that during the time he was serving his time in prison, his only son became a Heroin addict. Lieutenant Ahmad and Zeinal help Zeinal's son together to quit his habit.