
Ok this is just a hunched ok , HUNCHED. Is it possible the second couple is the younger sis and mr yummy abs red haired knight. It can happen by the time the sister come of age, mr yummy abs will be in his early 30 , so you know, from the vibes that im getting i feel that it might turn out that way ╮( ̄▽ ̄)╭ it is not uncommon this happened ٩(๑❛ᴗ❛๑)۶

I don't think they're encouraging it, they're just using their detective skills to solve the case and guess what? They solved it. They're right, the second couple (spoiler alert) is the red head and the little sister.
I hope they get married after she's 25. My parents have an age gap of 10-years old and they told me that they married after my dad was 25. They're in their 50s and 40s and they tell me how to this day, they still think they're 25 until they look in the mirror.
I guess you stop caring about the age gap after 25, and honestly? I'm reaching there and I can kinda see why. I used to hate the idea of an older guy, but I don't feel that way anymore.

You can take my comment with a grain of salt, since this is based on novel and manhwa spoilers I have read.
But it seems like the younger sister won't appear a lot in the story and will mostly just gather her strength and become the head of the Marquis household, earn the title, never get abused again, and then decide her own marriage, which seems like she thinks highly of the knight and thus chose him. Someone said that she just accepts the engagement during the last few chapters and they never appeared again. So we don't see their wedding, I think.
I don't know much of what happens between the two, but I do know that they trust each other the most. And the only ones who can put up with the other is themselves (since she's kinda headstrong and he's kinda mean, and they both don't mind that).

Its not for me, i have friend married with gape 17 years, my parents 13 years ╮( ̄▽ ̄)╭ is not common but its not rare either to be honest, so its not weird. Have u heard the saying love is blind ? Love overcome all ? Arranged marriage? Anything can happen
Also why not ? Its not wrong to be attracted to someone younger ? Im not talking about her current age im talking about in the future thats to come for them ╮( ̄▽ ̄)╭ i find not fault in that
I FUCKIN LOVE THIS SO MUCH.
BRUH I FELT IT EVERYTIME THEY HAVE SEX. OMG