Jak přišli kováři k měchu: Terezka is in love with Antonínek, a shepherd boy. However, her father, an old blacksmith, does not approve of their love, as he would rather see his daughter married to a decent man who could light a fire with his breath and to whom he could pass on his smithy. Poor Antonínek has no choice but to seek help from a dwarf living in the rocks. The dwarf gives him a bellows, and in the end, everything turns out well.