"840" features a stellar cast, led by Nasir Uddin Khan in the central role. He is joined by other acclaimed actors including Marzuk Russell, Fazlur Rahman Babu, Zakia Bari Momo, Shahriar Nazim Joy, and Zayed Khan. The production also shines a light on local talents, featuring actors from the Rajshahi and Naogaon regions.

Opening with a biting question—“When a man wins an election with 103% of the vote, what does he ask for next?”—the 3-minute trailer sets the stage for a sharp critique of political corruption. Nasir Uddin Khan, in the lead role, plays a flawed, power-hungry politician who will go to any lengths to secure public support and win a mayoral election.