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When a viral video indicates the probable truth behind the famous actor's questionable death, the Crime Investigation Department orders ASP Golam Mamun to reopen the case.

Despite the dreadful attitude, Mamun starts the investigation with two officers to find any lead from Arman's closest friends. Meanwhile, the accused videographer, Shanto's demeanor starts forming a grain of doubt.

Mamun traces Arman's wife, Sabina, to know more details about the death. But, little did he know what lies down between her and Banna. As Mamun gets hold of Arman's old fling, Sabnam, she faces a destructive situation.

Armaan, plagued by problems in his personal life, became intolerant of the people around him before his death. Desperate to seek justice, Armaan's mother, raises some tough questions in the press, informs Mamun about a mysterious man.

The disappearance of Arman's manager raises the question of some gruesome truths, which are yet to unravel. When Rajib decides to help Mamun with unknown details of Arman, Rajib's daughter, Nayma, gets to know the sinister past of Mamun.

Mamun discovers that Arman's affair with Sabnam influenced Arman to take a drastic step. When Mamun appoints Nayma and Shanto to become his informer, it reveals Shefali's foul play.

Mamun arrests Banna after Sumi reveals a gruesome past related to Banna and Khaled. While Mamun pressurizes Banna to unveil the truth behind Arman's death, Shafqat tells him about an old conspiracy with Khaled.

Old guilt haunts Mamun like a nightmare on the eve of uncovering the mystery of Armaan's death. After hearing Shefali's motive and Sabnam's truth, will Mamun be able to identify the root of Arman's death?