Originally, many ugly people are hard to find a partner. Even if the conditions for finding a partner are not very good, the ugly genes will not be passed on to the next generation, or there are not many children and not many gene carriers. But plastic surgery makes many people look good, especially those who are ugly will go to plastic surgery for the first time until they are perfect, so that they can get married and have children, and the ugly gene will be passed down. If married people have money, they can have many children, and ugly genes will not only be passed on, but also more carriers. ? If one day all the cosmetic surgeons in Korea suddenly disappear, a few years later, there will be many teenagers with pie faces and squints on the streets of South Korea. This is only the result that the phenotype has not changed in appearance. Ugliness is engraved in genes. When I say ugly newborn, I mean that the proportion of ugly children in the crowd is increasing. There are also certain factors of looking at faces in marriage and love. Under the condition of the same hardware and personal quality, good-looking ones are always more popular, which is human instinct. In fact, it may actually have a weakening effect. Because people who used to be ugly can't find someone, now ugly people can find someone. So ugly genes that can't be inherited can also be inherited. The number of people who are particularly beautiful and ugly will decrease, and the number of people who look at the middle level will increase. ? If we only look at the influence of appearance on marriage and offspring (regardless of the influence of economy and so on), on the one hand, ugly genes will be inherited like fakes; On the other hand, the chances of ugly people (after plastic surgery) finding people with natural beauty will increase, so that the next generation will naturally look better than the descendants of two ugly people. ? That is to say, if plastic surgery is popular among the whole people, the appearance of future generations will be less affected by choice, because natural appearance will reduce the number of pairs, leading to the appearance level of future generations closer to the median.