Some old-styled black magician migrants are suspected for the mysterious death of a boy, and their houses burnt down; but soon these good people turn back to life as the undead due to their powers and are hungry for revenge from the entire town.

It's all the setup for every freddy krueger film ever done, but again, the focus is on the teenagers, they're not freddy's stories.

Good point Nicholas.

'High plains drifter' had a similar situation (Man coming back from the dead to exact revenge on a town) but had a lead specific character.

Who are your protagonists? Townsfolk trying to escape the undead vengeance being wreaked upon them, or the migrants themselves? (I haven't seen many movies where the undead are the protagonists, so this makes it interesting to me - more interesting than the unsuspecting townsfolk).