Movie submitted by Pionchan:
A young boy lives with his family in a forest, every day he is immersed in a barrel with a green substance and beaten by his father. After several dives, his father reveals that this torment is to make sure that the skin of the boy will become invulnerable, the only weak point is where he can not hit him. One day, while the child is absent, the entire family is massacred. Then the boy begins his vengeance. Fighting against a foe on a bridge, with pointed stakes under it, the boy falls down but saves himself covering his ass with one hand: the weakness is revealed. Then, getting up, he kicks a sword that lies down to the adversary and kills him.