How to say “It’s an Unwritten Rule” in Korean? 📏

Hello!

Eating fried rice after Korean barbecue, having kimchi with ramen, or buying popcorn at the movies—some combinations feel so obvious that nobody needs to explain them.

In Korean, these unwritten rules and must-have combinations are often called 국룰 (gung-nyul).

What Does 국룰 Mean?

국룰 is short for 국민 룰 (gung-min rul), literally “national rule.” It playfully describes something that everyone seems to agree is the standard, the obvious choice, or the proper way to do something.

Depending on the situation, 국룰 can mean “it’s a given,” “it’s a must,” “that’s the rule,” or “it’s the classic combination.”

It is casual internet slang, so it works well in conversation and social media but not in formal writing.

Here are three common ways to use it.

1. When Something Is an Obvious Combination 🍜

Use 국룰 when two things naturally belong together:

• Korean: 라면엔 김치가 국룰이지.

• Pronunciation: ra-myeo-nen gim-chi-ga gung-nyu-ri-ji.

• Meaning: Kimchi with ramen is a given. / Ramen and kimchi are the classic combination.

The ending -이지 adds the feeling of “of course” or “you know that’s the rule.”

2. When Something Is the Standard Choice 🎬

국룰 can also describe what people normally do in a particular situation:

• Korean: 영화관에서는 팝콘이 국룰이지.

• Pronunciation: yeong-hwa-gwa-ne-seo-neun pap-ko-ni gung-nyu-ri-ji.

• Meaning: Popcorn at the movies is a must. / Popcorn is the standard choice at the cinema.

This does not mean it is a real rule. It is a playful way of saying that the choice feels obvious.

3. When Something Is a Must 🍚

Use 국룰 for a strongly recommended final step or routine:

• Korean: 고기 먹고 볶음밥은 국룰이지.

• Pronunciation: go-gi meok-go bok-kkeum-ba-beun gung-nyu-ri-ji.

• Meaning: Fried rice after Korean barbecue is a must.

Koreans often use 국룰 when talking about food combinations, daily routines, games, fashion, or shared social habits.

💡Quick Usage Tip

Although 국룰 is written guk-rul in letter-by-letter romanization, it is pronounced closer to 궁뉼 (gung-nyul) in natural speech.

A useful pattern is: A에는 B가 국룰이지. (A-e-neun B-ga gung-nyu-ri-ji.)

When it comes to A, B is the obvious choice.

국룰이야 (gung-nyu-ri-ya) is casual. The polite form is 국룰이에요 (gung-nyu-ri-e-yo).

Takeaway of the Day

라면엔 김치가 국룰이지! (ra-myeo-nen gim-chi-ga gung-nyu-ri-ji!)

Use 국룰 when something feels like an unwritten rule, an obvious choice, or a combination everyone agrees on.

One expression a day, make it yours.

하루에 한 표현을 내 것으로!