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Well, all of these cultures are interconnected, because they have lives as neighbors/friends/enemies for centuries. There are some similarities, and there are some decided differences. For instance China is one of the largest countries in the world, and the people are very diverse, depending upon their locations. So the cultures are different all over the country. There are 2 official languages, but that does not take into account the thousands of dialects that also exist. Japan is an island nation, and Korea is a peninsula, and both are extremely small in area. As you know, Korea is divided into 2 parts, and believe me when I say that there are some things about the culture of North Korea that are not like any other place on the earth.
Strictly speaking, I love Chinese food and Japanese food, but I am not fond of Korean food. I do not enjoy any of their music. Except the drums which I say in Korea. Chinese music and Japanese music really grates on my nerves. (But that is just me, and I have had several opportunities to listen to it.) I believe that the clothing of the Japanese is spectacular (I am speaking of the traditional kimono's and the more formal types of clothing.) I have found that each of these cultures has a history of respect and consideration for others. I am baffled by their necessity to "save face" and never admit publically that a mistake has been made.
I also know that it is much easier for us as Americans to accept the social faux pas of people who are not familiar with our traditions than most people from any of these cultures. Example: In China it is a sign of (prosperity) if a host can offer many different dishes at a meal, and the expectation is that the guest will eat his/her fill. It is also the expected thing to leave some food on the plate, indicating that the host was most gracious, but the guest had more than he/she could eat. Here in America, it is often taught that we need to clean our plates. There are many reasons for this, frugality, respect, etc., traditions, whatever, but it is not the cultural thing to leave food on the plate. But American's will not be offended if you leave food, nor will they be upset if you don't. In China, it is a sign of great dishonor that a guest is not able to get completely full. Is this foolish? Of course, but it is part of this culture, and therefore, it could cause hurt feelings. I am speaking from experience, so I know what I am talking about.
In Japan, of course, one must always take off shoes at the door, and there will always be slippers provided by the hostess. It again, is a sign of disrespect that t guest not remove his/her shoes. This again might seem like a very small thing, but it is a social faux pas that happens all the time.
You have to decide which of these cultures seems the most desirable to you. There are probably thousands of books and movies about these things, in addition to the information that can be found here on the internet. Also, if you have friends that are from these countries, then ask them questions about their traditions. Learn from them.
I wish you luck
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