Hoài and Vận fall in love during the war against the French. Vận fought as a guerrilla and Vận ferried guerrillas across the river. When peace comes, Vietnam is divided in two across the Bến Hải River, leaving them separated.

Lonely at old age, Định seeks solace in the companionship of a colleague who then moves in to live with him. Wary of an imminent marriage that will interfere with their inheritance, Định’s children scheme to break up his new relationship.

After the dangerous offensive launched on the embassy office in Saigon, Tư Chung and his comrades have to find ways to adapt to rising suspicions from the CIA advisors, as well as dealing with violent repercussions involving someone very dear to him. The third part of a series based on a real-life organization involved in intelligence activities in South Vietnam before 1975.

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.

The plot of the film revolves around revolutionary soldiers who come from different classes, but all share the same patriotism. They had to overcome many life-and-death challenges and enormous adversities in order to mobilise the masses to prepare for an uprising and seize power from the Japanese fascists, in a situation where the country fell into the tragedy of famine.

Posing as a privileged man working for his wealthy industrialist uncle, Commander of the Saigon Rangers Tư Chung prepares with his comrades for a secret meeting with a coming Vietcong officer, alias "K9". The first part of a series based on a real-life organization involved in intelligence activities in South Vietnam before 1975.

To keep up with his public guise, Tư Chung considers marriage with his "girlfriend" and tries to flatter some trust out of the CIA advisors who've been eyeing the pair, all the while following new orders to plan and launch an important offensive. The second part of a series based on a real-life organization involved in intelligence activities in South Vietnam before 1975.

The year 1968 approaches. Bubbling underneath festive spirits are quiet anticipations of a major escalation of conflict, alongside exciting dreams of a brighter future...that seems so close and yet somehow far away. Tư Chung, tasked with overseeing the joint offensive on supreme headquarters in Saigon at the first moment of the lunar year, prepares himself for the most beautiful and painful of hopes. The final part of a series based on a real-life organization involved in intelligence activities in South Vietnam before 1975.