A mentally ill man faces the consequences of a corrupt Indonesian politician as he is wrongly accused of murder, and all he wishes is to see his daughter again.

Dodo Rozak wants to be a good father to his daughter, Kartika. Despite his limited intelligence, he acts and behaves like children. It is Kartika who takes care of her father most of the time. Both live happily. Kartika is proud of her father, who sells balloons every day. However, their happiness does not last long. Dodo is arrested on charges of raping and killing a little girl. Dodo is imprisoned in cell No.7, which violent inmates inhabit. After various events, Dodo gets help to smuggle Kartika into his cell. Dodo and Kartika's closeness spreads happiness to inmates and guards in prison. They begin to doubt whether a loving man like Dodo could kill a little girl.