Wow! Looks like Manual Para Ser Feliz is not available on any streaming services in the world!

Juan is an accountant who for the last 10 years has worked at Etichetta Due, thanks to Daniela who was his girlfriend at the time and worked as a secretary for Osvaldo, the owner of the company. Because of his weak character and for being naive, Juan has always been the office's laughingstock. His only friend there was Eduardo until the day Juan found him having sex with Daniela (the mother of his two children)