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Who dropped 요 first

반말 is not a prize you award yourself because your TOPIK is fine.

If they are older, wait. If they say 말 놓아도 돼, you may drop 요. If you drop it first, you chose a fight.

Names: 씨 is safe at work. First name + 아/야 only when you are actually close and they are not above you.

Switching back to 요 mid-argument is a weapon. Don't.

Say these