I've been to a big party in Korea and people left and when someone asked about the people that left, someone said "I think they left." And that was that. But n

I've been to a big party in Korea and people left and when someone asked about the people that left, someone said "I think they left." And that was that. But now that I'm reading about Korean culture on this post, I think this may have been an extremely isolated incident. I don't know what was different about the event I went to however. Could it have been somewhat Americanized? Or maybe an extreme emergency situation where the person had to leave immediately?