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exactly 4 :) and all other even numbers :)

I always found that really interesting. I remember that the 4 sounds similar to death in Chinese (could be wrong though) and that's why they try to avoid that number. You're from Korea, right? Is it the similar over there?

Yeah. I live in Korea. It was a surprise to me too when I came here first. And sometimes there is even no number 4 button in the elevators. They just skip it or use symbols instead of number 4 :)