What happens when people exchange souls?

The exchange situation is not completely impossible.

If they do exchange, their memories will be changed. It is because you are in that body that you have the memory of that body.

Personality, personality and preferences will change. That is to say, although the memories of two people have been changed, the original habits of the body will not change, such as what food they like to eat or what they like. This is because people's conscious consciousness comes from the body, and the structure of the body will affect this conscious consciousness. This will, for which body, which body will have a preference.