이야 after a consonant (주말이야) · 야 after a vowel (저야) · 저야 좋죠 · 그거야 당연하죠
(emphatic) as for …, of course …; … sure, but (contrast)
Example
주말이야 괜찮지만 평일은 좀 바빠요.
The weekend is fine, of course, but I'm a bit busy on weekdays.
Word parts
A stronger, more emotional version of the topic marker 은/는: 'X — that goes without saying'.
Good to know
Common replies: 저야 좋죠 'That's fine by me', 그거야 당연하죠 'That goes without saying.' Not the same as the calling 야 after names (민수야!).