The Chinese and the Koreans are two distinct races. The original Chinese grew up around the Yellow River. The Koreans are a mixture of people who were on the Korean peninsula, in eastern China, Manchuria, up as far as Mongolia and into parts of Russia, and at the Tower of Babel. There are some Chinese whose families were originally Korean. When you say “Chinese,” you are actually talking about several people groups all mixed together now a days even though the originals were the ones who gathered at the Yellow River. Now a days, all Chinese don’t even speak the same language. The oldest empire in that part of the world was Gogoreyo who were ancient Koreans. It lasted for 5,000 years until there was so much fighting that the Koreans retreated to the Korean Peninsula and hid from the world. The Koreans are more homogeneous than any other group on the planet because they isolated themselves for so long. That is why so many Korean last names are the same, but they really don’t consider themselves related to the others because it was in ancient, ancient times when they were one family, and no one remembers.
As for the Japanese, they are part Chinese, a little Korean, and part Ainu. The Ainu were there first. They are not oriental, but they have black hair, dark eyes, and light skin. The Chinese, people from around the Yellow River, came later and mixed with the Ainu, and the mixture became the Japanese people. When Shila in Korea conquered Bekjae, another Korean group, the Bekjae royal family and other Bekjae escaped into Japan and mixed with the Japanese. The Japanese emperor is part Japanese and part Korean because the Japanese royal family and the Bekjae royal family intermarried. In ancient times, the people on Jeju, the island completely south of the Korean Peninsula, were considered Japanese, but now a days, they are Korean. Their Korean is slightly different from the rest of Korea, and they look slightly different. Some I have met from there actually look Japanese even though they are Korean, but others look Korean.
The Chinese and the Japanese are both genetically smaller than the Koreans. However, with them all eating similar foods, it influences the way their eyes are shaped and the length of their legs. Another thing that influences their legs to be shorter is that they sit on their legs when they sit in the floor and stunt the growth of their legs, but people in the west sit in chairs and allow their legs to grow. I read a book when I was in Japan called “the Kimono Mind” that said that people who eat rice have shorter legs than people who eat wheat because rice grows shorter legs and white grows longer legs. The Koreans also eat rice as do the Chinese and the Japanese, but they eat less rice than the Japanese and Chinese, and you can see a difference in how long their legs are. Most of them are taller than Japanese and Chinese and slim. Their weight is very important to them. They can’t put up with people getting too large. Even if someone happens to have big bones and muscles, they still consider them fat. The kimchee the Koreans eat kills their appetites because it has so much chili spice, and dietitians will tell you chili spice kills the appetite. The interesting thing is that sumo wrestling is a Japanese sport, but most of those big guys doing all that wrestling are not Japanese. Many of them are Korean or Mongolian, the larger oriental races.
As you can see, Koreans, Japanese, and Chinese look a lot alike to people on the outside who think they are one race, but they are not. People who don’t know think all Europeans are one race too, but just in the basic makeup of the original English people, there were Pict, people with black hair, blue eyes and white skin, Saxons, people with blonde hair, brown or blue yes, and white skin, and Gaelic, people with pink skin, blue eyes, and red hair. These three groups of people meshed to become the English people. If you go into France, they are a mixture of Romans and Gaelic. If you go to Spain, they are a mixture of Romans and Moors from Northern Africa. If you go to Hungary, you will find a mixture of Slavic people who are very tall with big noses and orientals whose ancestors were Mongolian. In Romania, they consider themselves Latin, but they are a mixture of a blonde haired people who were originally there and Roman soldiers. The blonde haired people are related to the Ukrainians. Those blonde people were the first people in Europe, the Dacians who were Greek.
The same is in Africa. All the blacks may look the same to you, but the Swahili and the Bantu peoples are very different. Bantu peoples are shorter than the Swahili. If you go to America, the American blacks are very different when you see them than the African blacks. Their skin is lighter because they are all part white and don’t even know it. Swahili are really tall, much taller than other Africans. Most people don’t know that among the Arabs in Morocco, there are some who have blonde hair and blue eyes in Ephraim, not just all black hair and dark eyes like the other Moroccans, probably because they were a mixture of Europeans and north Africans, but their families have been there so long, they have no idea they might have European ancestors. If people’s hair, eyes, or skin are noticeably different, we know they are different races, but there are other characteristics that people overlook like how tall they are, how big their eyes, noses, or lips are, and those are the ways you can tell the difference between the races in Japan, Korea, and China.