A director pays a visit to a hydroelectric plant construction site and gives a grandiose speech on the impending glory of its opening. His exaggerated body language soon becomes a running gag among the workers who pass around the rumour that he might have dropped the diamond ring during the speech, which the director ironically - and wholeheartedly- believes.

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.

After the liberation of the South, Cong volunteers to work at a pepper farm on the island. The members of the farm are elements with a rogue past, led by Dinh, who always disturb the peace and order on the farm.

An adaption from Vietnamese funny folktales.