Trần Tiến

Returning from long years studying abroad, Lâm finds out that his childhood sweetheart Sơn Ca has married another man. When Sơn Ca files for separation due to her husband's adultery, the two begins seeing each other again and rekindling the old flame.

A scientist dies while researching the toxins dropped by American bombers onto Southern Vietnam. His three students goes on a trip through the forest of Truong Son mountains to bring his remains and research documents back to the North, but soon find themselves developing the same symptoms like their professor.