To be honest, Koreans don't say "당신" or "그대" as you in English. It's used in the past like way back in Joseon Dinasty but thesedays we prefer say "너" or "그 쪽(refer to you)" instead.
2018년 11월 1일
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I never use it but some of korean learners use it..
2018년 11월 1일
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I don't think you ever really want to use 당신. I think it tends to be really rude