"Yesterday's Flowers" looks back at history from a new perspective and tells a love story related to World War II. A respected German Holocaust scholar is at the peak of his career, but he is in a mental crisis. It turns out that his grandfather was a Nazi war criminal. This unknown family history has caused him to suffer in his heart. At this time, he met a passionate Jewish girl, and the two fell in love with each other. But when the girl found out that it was the scholar's grandfather who killed her grandmother, she finally couldn't accept it, and the two lovers broke up regretfully. Five years later, the two met again on the street. The girl was already a mother. Looking back on the past, they could only wish each other well.