The film is set in the winter-spring battle that lasted 60 days and nights from late 1946 to early 1947 in Hanoi, the story follows the militiaman Van Dan and his love story with the piano-loving lady Thuc Huong. When others had evacuated to the war zone, they decided to defend the capital that had been devastated by bombs and bullets, despite the dangers that awaited them.

After Thi's mother died, her father was unable to raise her, so she lived with her aunt-in-law and grandmother. Thi's grandmother left her a ring when she died. While packing her things, Mrs. Mai discovered it and scolded Thi, causing her to run away from home.