Help me find this manhwa

So it’s set in a floating kingdom and the mc is a spoiled princess with an older brother (?) that spoils her and she’s engaged to a guy that doesn’t really care abt her but she likes him. When he proposes to her she told him not to wear the green suit (or orange suit) bc it makes him look like a carrot (he has orange or green hair) then their kingdom gets attacked because most of the wizards were off duty to make fireworks for her birthday and then she had to go off on a quest below the floating island with a black haired guy to avenge her destroyed kingdom. Outside of her kingdom it’s a bunch of super poor areas and that’s as far as I got!!