If you never read Machado de Assis in your life, YOU DEFINITELY SHOULD. He is a one-of-a-kind author, one of the most underrated ever and the best Brazilian writer. Of all times.
When you read his stories you have the impression they were written in the XX century, but they were actually crafted in 1800s. Machado was so ahead of his time! Some even said he is a Modernist (although he had a romantic phase).
Think about an Brazilian Oscar Wilde, with more novels for you to relish in the dark disgraces of human nature, all very humorous, all very witty.