When someone says thank you after you helped them. A humble and polite response showing modesty.
천만에요 (cheonmaneyo) = polite standard. 천만에 (cheonmane) = casual with friends. 천만의 말씀입니다 (cheonmanui malsseumimnida) = very formal.
Yes: 별말씀을요 (byeolmalsseumeulyo) = Don't mention it, 아니에요 (anieyo) = It's nothing.
천만에요 (cheonmaneyo) means "You're welcome." Very humble polite response. 천만 (cheonman) = ten million / not at all (humble meaning: it's nothing compared to), 에요 (eyo) = it is (polite). Literally downplaying your effort.
1. After help: Someone says thank you.
2. After gift: Show modesty.
3. Service: Customer thanks you.
You're welcome. I'm glad I could help.
You're welcome. Don't mention it. (Very formal)
You're welcome. Tell me anytime. (Casual)
It's nothing. You're welcome.
• 별말씀을요 (byeolmalsseumeulyo) - Don't mention it
• 아니에요 (anieyo) - It's nothing / No worries
• 괜찮아요 (gwaenchanayo) - It's okay