This film is adapted from the novel of the same name by Irving Yalom, a best-selling psychotherapy author. In Vienna at the end of the 19th century, Breuer, a medical master who was in his forties, suddenly received an unexpected letter. The sender turned out to be the socialite Lou Salome (Katheryn Winnick). Although Breuer hesitated suddenly, he went to the cafe as promised. Salome's purpose this time was to hope that Breuer could help her close friend, the existentialist master Nietzsche, who had an unforgettable "sense of pain" that accompanied him every day. In order to cure Nietzsche, who was unwilling to receive treatment at all, Breuer had to pretend to need Nietzsche's help. For a whole month, Breuer and Nietzsche had in-depth conversations in different places. So, one psychotherapy after another, not knowing who was the patient and who was the doctor, began...