Why Koreans have big pie faces

This question must be explained scientifically. Can certainly answer the Korean people big cake face more mainly out of heredity. Chinese, Japanese, Koreans are East Asian environment to survive, living habits and eating habits, although there are differences, but not so much as to affect the look too much, the reason why the Chinese, Japanese, Koreans in the same yellow skin and black hair case or not the same growth is mainly because of heredity. Because Chinese, Japanese and Koreans are not of the same ancestry, you are wrong to think that they are of the same ancestry. Chinese Han-Tibetan ethno-linguistic peoples (Han, Tibetans, Qiang, Miao, etc.) are of Central Asian ancestry, Koreans are of Northeast Asian Tungusic ancestry, and Japanese are of mixed South Tungusic and Brown ancestry. Molecular anthropology has proven that Chinese, Japanese and Koreans have huge Y chromosome differences and are not a species at all. Lastly to answer your question, Koreans have big pie faces mostly because of their Hmong genes and the Korya, Nivkh genes from Tunguska, which is the root cause. You go look at other ethnic groups in Northeast Asia, Mongolians, Oroqen, Ewenki these are basically big pie face.