Possessive

의: the particle that keeps disappearing

의 is the easiest Korean particle to understand and one of the easiest to get wrong, because the rule is simple and native speakers ignore it constantly.

What it does

의 (ui) joins two nouns and marks the first one as the owner. English does this with "'s" or with "of", and it puts the marker in different places depending on which one you pick. Korean always does the same thing: the owner comes first, 의 sticks to its back, and the thing owned follows.

• 선생님의 안경 (seonsaengnim-ui angyeong) — "the teacher's glasses"
• 한국의 역사 (hanguk-ui yeoksa) — "the history of Korea"
• 친구의 이름 (chingu-ui ireum) — "my friend's name"

Notice the second one. English flips to "of" there and reverses the order; Korean doesn't change anything. Owner, 의, thing. That consistency is the good news.

It isn't pronounced the way it's written

의 as a syllable normally sounds like "ui". As this particle, it's pronounced 에 (e).

So 나의 꿈 is written na-ui kkum and said na-e kkum. Both are correct; one is spelling and one is speech. This catches people who learned the alphabet carefully and then couldn't find the word they were hearing.

Most of the time, it vanishes

Here's the part textbooks underplay. In ordinary Korean, 의 gets contracted or dropped outright.

With pronouns it contracts:

• 나의 → 내 (nae) — "my", casual
• 저의 → 제 (je) — "my", polite
• 너의 → 네 (ne) — "your", casual

So 나의 꿈 becomes 내 꿈 (nae kkum), and you'll hear 내 꿈 far more than the full form. The long version survives in writing, song lyrics and anywhere someone wants a formal or deliberate tone.

With regular nouns it often just goes:

• 친구의 집 → 친구 집 (chingu jip) — "my friend's house"
• 한국의 음식 → 한국 음식 (hanguk eumsik) — "Korean food"

Two nouns sitting next to each other are already understood as belonging together, so the particle becomes optional. Dropping it sounds natural and slightly more casual. Keeping it sounds careful.

When to keep it

Leave 의 in when the relationship needs to be unmistakable, especially with longer phrases where the reader might not see where one noun ends and the next begins. Formal writing keeps it. Contracts, articles and academic text keep it.

Leave it out when you're speaking casually and the two nouns are short and obvious.

If you're unsure, keeping it is never wrong. It'll sound a little stiff, and that's a much smaller problem than being unclear.