April 17 is World Hemophilia Day. Also known as hemophilia. Felix from Düsseldorf is a patient. His blood clots much more slowly than in other people. As a result, wounds only close much later. He has bruises everywhere. Internal bleeding can occur all of a sudden. The boy from Düsseldorf received the diagnosis before his first birthday. Since then, his everyday life has been shaped by hospital visits and fears. The 10-year-old was operated on three times. He gets injections against the disease several times a day. This is to replace the missing coagulation. The punctures are torture for Felix. Three years ago, the ray of light came: A new drug for the treatment of severe hemophilia patients.