Gregory Delaplace, an anthropologist at the University of Paris Nanterre, answers this question that has occupied many.

The scholar mentioned that there is no society or culture that has not spoken about the possibility of the return of the dead. Every civilization has its own imaginations about "the afterlife" and its idea of the path and form that the dead take to return. In Mongolia, for example, ghosts are not considered in the full sense of the word as we imagine them in the West, but are considered little demons or monsters. In all cultures, supernatural phenomena, i.e., communication between a dead being and a living person, are exactly similar.

In Vietnam, for example, in the village of Cam Rie, residents often encounter ghosts of past wars - American and French soldiers - and those young Vietnamese who died far from their homes without their bodies being buried in valuable cemeteries. The villagers do not hesitate to care for the "orphaned" dead, and even "adopt" them, hoping that their loved ones who died far from home will also be cared for there.

The locals imagine these ghosts because they remind them of the painful history experienced by the Vietnamese nation.