Why do Hakkas have to "pick up bones" and rebury after their death?

Hakkas have a special custom of burying their dead relatives. That is, instead of choosing a burial place after death, just find a place and dig a hole that can be stuffed into a coffin according to the natural height difference of the terrain. A few years later, Mr. Feng Shui was asked to choose a tomb and put the body of the deceased in a clay pot, which was called gold. The pottery jar is called Jintan. And then reburied. If it is a long-distance migration, this bone-cultivated Jintan will also move to a new residence with his family and choose a place to be reburied. This custom may be due to the fact that Hakkas do not stick to their own homes, and will move there as long as they can settle down better. After death, bones can be collected regardless of age, and the time can be extended at will, free of charge. Some even lasted until 10 years or 20 years later.

Hakkas don't have to "pick up bones" to be reburied, as long as they think that the feng shui of the first burial is not good. As for the reason, it is obviously that the so-called "Feng Shui" is not good.