Even native Korean speakers often mix up 웬 and 왠 in texts and chats. Use 웬 when it means ‘what kind of / how come,’ while 왠지 is the contracted form of 왜인지, meaning ‘for some reason.’ So ‘웬일이야?’ is the correct spelling.
❌ COMMON MIX-UPS
You may see ‘왠일이야?’, ‘왠만하면’, or ‘웬지 이상해.’ in casual messages.
✅ WRITE THEM THIS WAY
The standard forms are ‘웬일이야?’, ‘웬만하면’, and ‘왠지 이상해.’ 왠지 is special because it comes from 왜인지.
WHY THE TWO FORMS?
웬 is a determiner meaning roughly ‘what kind of’ or ‘what happened.’ 왠지 is an adverb contracted from 왜인지 — literally, ‘for what reason.’
A CHAT EXAMPLE
A: 네가 먼저 연락하다니, 웬일이야? — ‘You texted first? What’s the occasion?’ B: 그냥 왠지 네 생각이 났어. — ‘I just thought of you for some reason.’
ONE MORE SPACING TRAP
웬일 is a single dictionary word, so it is written together. In phrases such as ‘웬 말이야,’ 웬 simply modifies the following noun, so the words are spaced.
