당신이 · 당신을
you (between spouses, in songs or writing); dear
Example
여보, 당신 덕분에 정말 행복해요.
Honey, I'm really happy thanks to you.
Word parts
Originally 'the very person in question'; the syllables don't help much.
Good to know
Don't use 당신 for 'you' with strangers — it can sound rude; use the person's name or title instead.