What's the difference between "잘 먹으세요"" and "잘 드세요"?
I'm confused between "잘 먹으세요"" and "잘 드세요"
I don't know what "잘 드세요" means o.o and I think "잘 먹으세요" is eat well..
How do you best say "Please eat well" to a person?

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Both sound a bit odd at least to me, we usually say "맛있게 먹으세요" or "맛있게 드세요". "잘" is often used with "반말" like "잘 먹어", so I can say the best and safe way to say that is "맛있게 드세요." in informal and polite way.

\^o^/

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It means generally " have a good meal"
But 잘 드세요 is used to senior or person who is older than me. 잘 먹으세요 is not natural. 
So u can say it in korean  잘 먹어 or 맛있게 먹어