"This married couple is happy."

Translation: 이 부부는 행복해.

[SvedishPlumber]

What would differentiate 부부 from being just a couple? Just context or am i missing something?

[emsuzz]

according to naver dictionary, 부부 specifically means married couple

[moira142592]

I wrote 이 부부는 행복해요
and got it marked as a typo because of 요. Since it is very unclear what a typo is... Is it really a typo or rather another solution? since there is no context implying the formality...
would appreaciate the grammatical explanation @duolingo!

[ZoeGenesis]

That's not a typo at all; the 요 simply made the sentence more formal while still keeping the same meaning. Your answer should have been accepted. I would report it.