매일 vs 맨날
매일
- 毎日, “ever day”
- Comes from kanji so more formal meaning
- Used in written stuff like essays
- More formal than 맨날 but can still use it in speaking
맨날
- “All the time” feeling
- Korean expression, not kanji-based
- Informal
- Mostly spoken but can use in informal online situations (Twitter)
- Don’t write it in an essay
I don’t know if I’ll write more of these about Korean in the future.