The true story of a high-school history teacher who decides to hide a progressive sight loss from everyone surrounding him - his colleagues, pupils, even the ones who really care about him, because of the fear of losing his job and trying to save his dignity. Due to a genetic disorder, Kacper is faced with a very real possibility of permanent blindness. Initially heartbroken, he attempts to hide his health problems from his bosses driven by his desire to keep his job and to help his students with the final exams. The only person who knows about Kacper's problem is his best friend Wiktor. Meanwhile, Kacper enters a relationship with his colleague Ewa, and tries to help a rebel student Klara, who hides a secret of her own.
Kacper, a middle-aged high-school record instructor, begins to reduce his eyesight. The medical diagnosis leaves number hope. Initially heartbroken, he efforts to full cover up his health issues from the exterior world.