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미안해요 (mianhaeyo) is a polite way to say “I’m sorry” in Korean. You’d use 미안해요 when you want to apologize in a friendly or casual setting, like if you’re late to meet a friend or if you accidentally interrupt someone. It’s like saying, “Sorry about that” or “My bad” in a respectful way.
If you’re talking to close friends or people you’re really comfortable with, you can shorten it to just 미안해 (mianhae).