Based on the level of respect or formality, you can say "You're very kind!" in Korean in 3 ways:

• you: neo-neun (너는), dangsin-eun (당신은), dangsin-ggeseo-neun (당신께서는)
• very: cham (참), maeu (매우), goingjanghi (굉장히)
• kind: chinjeol-hada (친절하다)



Please refer to How to pronounce Korean Alphabet for the English pronunciation in this answer.