Is it more important to clean up your apartment or to go out on a perfect sunny and warm day? What is really important in our lives? Can optimism be learnt? "Category: Optimist" is a film about facing a potentially lethal disease – leukemia – and everything that goes with it after treatment. If patients manage to live, due to a fortunate combination of medical science, doctors’ efforts, family and friends and their own persistence, their life will change. While facing the challenges ahead, the most important thing is to be an optimist.