Formal:
* 천만에요 (cheonmaneyo): This is the most common and polite way to say "you're welcome". It literally means "ten thousand times no" and implies that the speaker is not worthy of thanks.
* 별 말씀을요 (byeol malsseumeulyo): This is another formal way to say "you're welcome" and literally means "not at all". It is a slightly more casual expression than "천만에요".
Informal:
* 아니에요 (anieyo): This is the most common informal way to say "you're welcome". It literally means "no".
* 괜찮아요 (gwaenchanaeyo): This literally means "it's okay" and can be used to express that you're not bothered by the person thanking you.
* 별거 아니에요 (byeolgeo anieyo): This means "it's nothing" and can be used to downplay the favor you did.
It's also important to note that the level of formality depends on the context, your relationship with the person you're talking to, and your age difference. For instance, you would use "천만에요" when speaking to an elder or someone in a position of authority, but "아니에요" when speaking to a friend or someone your own age.
Here are some examples:
* Formal:
* "고맙습니다" "천만에요" (Thank you. You're welcome.)
* "감사합니다" "별 말씀을요" (Thank you. You're welcome.)
* Informal:
* "고마워" "아니에요" (Thanks. You're welcome.)
* "괜찮아요" (You're welcome.)
* "별거 아니에요" (You're welcome.)
Ultimately, the best way to say "you're welcome" in Korean is to choose the phrase that feels most appropriate for the situation.