Who Killed Sara?

Alex, a man convicted of a crime he did not commit, is released after 18 years behind bars. Upon leaving, he only wants revenge on Rodolfo Lazcano, the person responsible for the death for which he was sentenced. Things get complicated when Alex starts a sentimental relationship with Elisa, the Lazcano's youngest daughter, and when he discovers that Rodolfo is innocent and that someone else, who has skillfully kept in the shadows, was the true cause of his disgrace. [Source: Netflix]