what s rude behaviour for korean peoples?

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Most of them are similar to other countries.

Behavior that only Koreans feel rude usually exists when talking with superiors or elders.
1. If you speak casually to someone you've never met before (반말)
2. Putting your hands in your pockets when you talk
3. Sitting cross-legged when you talk
4. Putting the business card in your pocket without looking at it as soon as you get it

This isn't rude, but it's something you might not know.
We don't change our last name when we get married, and we don't call the last name when we talk