Why do two couples always get sick together?

Birth, aging, illness and death are the fixed laws of human life in this society. When couples are together, they often say that they care about each other, that is, if one of them is sick or has other problems, they should help each other and care for each other. This is one of the purposes of marriage, and another is to have children. One of the husband and wife is sick, or even both of them are sick at the same time. This is a normal phenomenon and has nothing to do with the eight characters. Couples with different characters will definitely get sick, and couples with very identical characters will also get divorced. Don't think that it is unscientific and of course wrong to link some of your disappointments with eight.