In marking the centenary of Bulgarian cinema in 2015, "Yesterday" was voted the fourth-greatest Bulgarian film of the century by viewers of BNT.
Many of the elements depicted in the film were based on true events.
The role of the English teacher was played by the Scottish Christine Bartlett, who taught the language at the Sofia English Language School.
The screenplay is based on the novel "Yesterday" by Bulgarian writer Vlado Daverov.