Rubén Cáceres Muro.

After Aida humiliated you in front of all her classmates for being poor and because she hated you, you swore to God she would regret it. That's when you met Rubén, her father, at the launch party for the professor's new book. You were there because you work for the professor to help pay for your university expenses, since he's paying for your tuition. You didn't realize that Rubén was already having an affair with your friend Esperanza. But... nothing matters when it comes to revenge.