왜(wae)
The most common and casual interrogative asking for a reason or cause
When to use
casual conversation, asking friends, simple reason inquiry
The nuance
Used mainly in everyday conversation; concise and direct; suitable for spoken language.
왜 vs 어째서: Two Ways to Ask Why
왜 (wae) · 어째서 (eo-jjae-seo, eojjaeseo)
‘왜’ and ‘어째서’ both ask for reasons, but ‘왜’ is more casual and common while ‘어째서’ sounds more formal and literary.
Word-by-word breakdown
One lane per word — no nested boxes, just the gist.
어째서(eo-jjae-seo, eojjaeseo)
An interrogative asking for reasons, somewhat more formal and literary than ‘왜’
When to use
writing, formal questioning, formal situations
The nuance
Used mainly in writing or formal situations; sounds more formal and serious.
Real-world examples
왜 그렇게 늦었어요? ⭕
wae geu-reoh-ge neuj-eoss-eo-yo? ⭕, wae geu reoh ge neuj eoss eo yo? ⭕
A natural and concise question in casual conversation.
어째서 그렇게 늦었어요? ⭕
eo-jjae-seo geu-reoh-ge neuj-eoss-eo-yo? ⭕, eo jjae seo geu reoh ge neuj eoss eo yo? ⭕
Appropriate expression in formal situations or writing.
왜 그렇게 늦었습니까? ⭕
wae geu-reoh-ge neuj-eoss-seup-ni-kka? ⭕, wae geu reoh ge neuj eoss seup ni kka? ⭕
‘왜’ can be formal when combined with polite speech.
어째서 너 그렇게 늦었어? ❌
eo-jjae-seo neo geu-reoh-ge neuj-eoss-eo? ❌, eo jjae seo neo geu reoh ge neuj eoss eo? ❌
‘어째서’ is formal and sounds odd with informal speech.
왜 너 그렇게 늦었어? ⭕
wae neo geu-reoh-ge neuj-eoss-eo? ⭕, wae neo geu reoh ge neuj eoss eo? ⭕
Natural informal question among friends.
어째서 그가 그렇게 행동했는지 모르겠다. ⭕
eo-jjae-seo geu-ga geu-reoh-ge haeng-dong-haess-neun-ji mo-reu-gess-da. ⭕, eo jjae seo geu ga geu reoh ge haeng dong haess neun ji mo reu gess da. ⭕
Suitable for explaining reasons in writing or formal contexts.
왜 그가 그렇게 행동했는지 모르겠다. ⭕
wae geu-ga geu-reoh-ge haeng-dong-haess-neun-ji mo-reu-gess-da. ⭕, wae geu ga geu reoh ge haeng dong haess neun ji mo reu gess da. ⭕
Frequently used expression in everyday conversation.
왜 어째서 그렇게 했어요? ❌
wae eo-jjae-seo geu-reoh-ge haess-eo-yo? ❌, wae eo jjae seo geu reoh ge haess eo yo? ❌
Using both interrogatives together is redundant and unnatural.
Quick quiz
Which expression is natural when casually asking a friend for a reason?
친구에게 간단히 이유를 물을 때 어떤 표현을 쓰는 게 자연스러운가요?(chin-gu-e-gegan-dan-hii-yu-reulmul-eulttaeeo-tteonpyo-hyeon-eulsseu-neungeja-yeon-seu-reo-un-ga-yo?, chinguegegandanhiiyureulmuleulttaeeotteonpyohyeoneulsseuneungejayeonseureoungayo?)Which expression is suitable for asking reasons in formal writing?
공식적인 글에서 이유를 묻고 싶을 때 적합한 표현은?(gong-sik-jeok-ingeul-e-seoi-yu-reulmut-gosip-eulttaejeok-hap-hanpyo-hyeon-eun?, gongsikjeokingeuleseoiyureulmutgosipeulttaejeokhaphanpyohyeoneun?)How does ‘어째서’ sound when used with informal speech?
‘어째서’를 반말과 함께 쓰면 어떤가요?(‘eo-jjae-seo’reulban-mal-gwaham-kkesseu-myeoneo-tteon-ga-yo?, ‘eojjaeseo’reulbanmalgwahamkkesseumyeoneotteongayo?)
What does it mean?
More comparisons to explore
- 라도 vs 아도: Nuance Differences in Choice and Concession
- 조차 vs 마저: Difference Between Surprise and Inclusion
- 보다 vs 처럼: Difference Between Comparison and Simile
- 만큼 vs 정도: Differences in Expressing Comparison and Degree
- 어떻게 vs 어떡해: When to Use Each
- 그냥 vs 바로: Choosing Naturally
- 아마 vs 혹시: Difference Between Guess and Possibility
- 꼭 vs 반드시: When to Use 꼭 or 반드시?