you can say you're welcome in so many ways as it depends on the person you are talking to
1- If you are talking to a friend or a younger person you will say (Informal) -
아니야 (aniya)/ 천만에(cheonmane)/ 괜찮아 (gwaenchana)
2- If you are talking to an older person you will say (Polite):
아니에요 (anieyo) /
천만에요 (cheonmaneyo) / 괜찮아요 (gwaenchanayo)
3- If you you want to say it in a( formal )way you will say : 아닙니다 (animnida)
