Following the 1954 Geneva Accords that partitioned Vietnam into two zones at the 17th parallel, a pregnant Dịu remains back in the South with her family while her husband has to move up North. At home, the young woman has to juggle between the duties of a liberation fighter and a mother while enduring her enemies' tortures and imprisonment, as she assumes the leadership of an underground liberation movement after its previous secretary was assassinated

As the new government takes over South Vietnam following the Fall of Saigon, civil engineer Dương Tấn is fearful of imminent repression. He and his colleagues are dispatched to fix a hydroelectric plant where they meet Đỗ Long, a bubbly engineer from the North.

A woman volunteers to help the Revolutionaries' trucks hide from bombing raids in Truong Son forests.