phrase
B2
used to strongly say 'no' or 'not'
"Did you find it difficult?" "Not at all."
“어려웠나요?” “전혀요.”
B1
used as a polite response to thanks
"Thank you for your help." "Not at all."
“도와줘서 고마워요.” “천만에요.”
translation
전혀, 천만에요