Three struggling musicians share an apartment.

Catita is a simple and poor woman who dreams of that her son stands out on something important to help her out of his humble. But she opposes to him being boxer, therefore constantly fighting with her husband.

Inspired by Alexander Dumas's novel The Corsican Brothers, Alma de Acero presents a delightful spin on the classic story of twin brothers (both played by Luis Aguilar) and their contrasting lives. As a singer in a nightclub, one brother has chosen a life of peaceful simplicity; the other, however, has chosen a troublesome lifestyle that leads to numerous run-ins with the law, forcing the vocalist to risk his own life to save his sibling.