Genetically, there is no difference between a North Korean and a South Korean. Many of them are even relatives. However, things have been changing since the two countries separated. There is a difference in clothing, in word choice when they speak, in ideology, and nutrition. These cause slight differences that unless you know a bit about Korea and the Korean language, it is hard to tell, but the slight difference is there.
The South Koreans are into clothing! They like the latest styles. The young people wear blue jeans like young people from other countries. The young women actually wear more dresses than I have seen in other countries. The young S. Korean women are obsessed with being beautiful. These young women wear makeup, stylish clothing, and have well kept modern hairdos. They think it is just fine to have plastic surgery to make themselves more beautiful. Many of them have fancy manicures. In the summer, many of the young women like to put their hair in a pony tail and wear a baseball cap putting the pony tail out the back of the hat.
The young men and women both of S. Korea are taller and better fed than the generation before them. My Korean son in law towers above his parents. He isn’t fat in the least, but some young Korean men are slightly husky because they like exercise, but are also very well fed. My Korean son in law is well fed, but doesn’t look like it because his growth was stunted as a child because his mother was worried about giving him things like bread because he had so many skin allergies. I can’t imagine how much bigger he would have become compared to his parents had she given him more food as a little boy.
The young South Korean men don’t wear suits until they go to work, and after that, that is all they seem to wear. Lots of South Korean men wear suits all the time. As the South Korean women get older, many just primp more and more. They get the plastic surgery to stay young looking. They wear false eye lashes and lots of makeup. They get their hair dyed and styled at the hair shop. Even the S. Korean men get their hair dyed.
There are always those older ladies or men who don’t take care of themselves very well in S. Korea like in any country, but even if they don’t, the S. Korean women will still get their hair dyed. No one lets their hair go gray.
If you were to ever run into a North Korean, which I have. Their clothes will not be as nice and up to date. Their hair won’t be so perfectly coifed. When they speak, their vocabulary will be different because they haven’t added new Korean words the S. Koreans have made up with time or English words the S. Koreans have added. A S. Korean is more likely to speak English, and N. Koreans don’t. A N. Korean may look less well fed than a S. Korean.
In North Korea, they choose pretty girls to be police women, and their suits must fit perfectly and be worn perfectly. The North Koreans will be shorter than the S. Koreans because they haven’t had the advantages of food that the S. Koreans have had. Kim Jong Un only looks chubby because he has led a more luxurious life than the others in N. Korea.
Even if a N. Korean has escaped from N. Korea, they may still be distrustful. They were raised with distrust. Communism breeds distrust, jealousy, and fear. Even when they escape, it takes time to get over it. There were N. Koreans in Seoul that a S. Korean preacher spoke to, and they said they wouldn’t go to church as long as there were Americans there because they didn’t trust Americans. They were brain washed in N. Korea, and it takes them time to figure the world out. I had a N. Korean in one of my classes, and she was very quiet. She didn’t mix well with S. Korean students because she was especially timid. It will take her time to get over what she has been through, if ever.
They young S. Koreans are very much like a young American. They play video games. They go to the movies and watch super hero movies, musicals, Disney movies, etc. that all the American young people are watching. The difference between young S. Korean people and young Americans is that the S. Koreans are more innocent and in better health. There are no drugs in S. Korea. Marijuana has not been legalized like in America. You don’t find young people sleeping around or gays in the S. Korean society. At my daughter’s job in America, one of the workers is actually transsexual and lives without the benefit of marriage with a man and a woman, a three way relationship. Those kinds of things just don’t happen in S. Korea. The S. Koreans are much more innocent than the Americans. The young S. Koreans don’t drive because they don’t have to, and the walking makes them healthier. They go by bus and subway, but all young Americans drive. You have to drive in America. However, the S. Koreans have freedom like the Americans have. The North Koreans don’t have freedom or food and are growing socially different from the S. Koreans, and it makes them slightly different from the S. Koreans even if they are genetically the same.