Why Are Koreans Shocked That Americans Don’t Know Their Blood Type?

One of my biggest culture shock moments after moving to the U.S. happened during a completely normal conversation with my American husband. I asked him what his blood type was, and he casually said, “I don’t know.” I honestly thought he was joking.

In Korea, knowing your blood type is extremely common. Most people learn it when they’re young, and it even becomes part of casual conversations. Growing up, I constantly heard things like “Type A people are organized” or “Type B people are playful.” People sometimes talk about blood type almost like personality types or zodiac signs.

So when my husband told me he had absolutely no idea what his blood type was, I was genuinely shocked. After living between Korea and Boston, though, I realized Americans usually only think about blood type in medical situations. In Korea, it became part of everyday culture for decades.

Of course, there’s no scientific proof that blood type determines personality. But culturally, it’s still one of those tiny things many Koreans instantly recognize and connect over.

It’s funny how something that feels completely normal in one culture can sound so strange in another.