잘 자, 내 꿈 꿔

The line, explained

This is the last line of a lullaby, sung to someone who is not a child. 잘 자, 내 꿈 꿔 — 'sleep well, dream of me'. The first half is the standard Korean goodnight. The second half is a flirt so famous that everyone in Korea knows it. And the grammar lesson is hiding in the very first syllable: 잘, the word that turns an ordinary verb into a wish.

잘 means 'well'. By itself it is just an adverb — 잘 먹었어 means 'I ate well'. But put it before a casual command and something shifts: 잘 자 (sleep well) is how you say goodnight, 잘 가 (go well) is how you say bye to someone leaving, 잘 지내 (live well) is 'take care'. English wishes people a good night; Korean tells them to do the thing well. The command form makes it feel like you are handing them the good night directly.

자 is 자다, 'to sleep', in its shortest casual command form — just the stem. Korean casual commands often look like the bare verb stem plus 아/어, and for 자다 that collapses to 자. The comma after it is a breath. 내 is 'my', and 꿈 is 'dream', the noun. Together 내 꿈 means 'my dream', but in this phrase it is understood as 'a dream about me' — Korean lets the possessive stretch that far.

꿔 is the verb 꾸다, 'to dream', in casual command form. Korean does not say 'have a dream' or 'dream a dream' — it says 꿈을 꾸다, literally 'dream a dream', with the noun and the verb sharing a root. The lyric drops the 을 for rhythm, leaving 꿈 꿔. So 내 꿈 꿔 is 'dream my dream': see me when you sleep. It is cheeky, it is confident, and every Korean speaker knows it is a line.

Back to 잘, because it is the part you will reuse. Swap the verb after it and you have most of your goodbyes: 잘 가, 내 꿈 꿔 (bye, dream of me) to someone leaving your door; 잘 있어, 내 꿈 꿔 (take care, dream of me) if you are the one leaving; 잘 쉬어 (rest well) to a tired friend. The polite forms add 요 (잘 자요), and for grandparents you switch to the honorific 안녕히 주무세요. One adverb, a lifetime of warm exits.