When did the ancestors come back and leave in the first seven nights?

There are ghosts around, and there is a certain time limit for staying in the house.

Ghosts will drag the dead away by force.

If you walk slowly, you will hit it on the back with a red-headed black paint stick.

You can refer to the ghost film (horror film) Sammo Hung Ching-Ying Lam.

The victim will be possessed by insects when he enters the house.

I think it should be to restrict the victim's free movement or noise.

When you leave, you will become a soul and be taken away by ghosts.

There is a custom here, which is to send light.

People have just died and don't know they are dead, but they can still move freely. Others can't hear them and can't touch strangers.

It takes seven days to deliver the light (that is, light candles at the grave of the deceased).