In 1932, Koster directed his first film in Berlin, the comedy "Thea Roland". Koster, who was in the midst of directing his second film "Das häßliche Mädchen", had been the subject of antisemitism, and knew he had to leave. He lost his temper at an SA officer at his bank during lunch hour and knocked the officer out. When the film, written by Koster with Felix Joachimson, had its premiere in autumn 1933 their names were deleted and both went into exile.