
In chinese there's a saying of 鸡跟鸭讲, which basically means a chicken can't communicate with a duck- people with different experiences, understandings of norms, cultural differences etc cant understand or communicate with each other.
Mc is the chicken and everyone else are ducks.
They have freaking different knowledge of common sense it's like mc is an alien or something

I'm thinking that ifeveryone in MC's family is cursed and even his 2 older siblings died because of the curse... what makes his parents safe from the curse? And how does his parents and family own a thriving business??

This. I've been thinking about this before. Did the curse skip the parents? Or in every generation, 1 sibling survives to continue the family line? Then MC should be spared but since he's gay, the line ends with him. He won't have biological children. Unless the curse is passed even to an adopted one, if they do adopt or something.
Me over analyzing

Little Lord, oh little lord, you are going against your own kingdom's royalty in favour of a foreign kingdom's king.... that's almost treason

it really isn't though, since at no point those men said it was by royal order + the men in armor explicated started in a thought bubble that the order was given by Varabus but "not under his name as royalty" = so it's not a royal order
however, Varabus may nevertheless hold a grudge and since he has many ressources both under his royal authority and outside of it, he could indeed try to harm the little lord's business, reputation or something else
Side tracking a bit, but this manhwa really shows the importance of hair colour.
Glenn with brown hair and green eyes makes me feel like he's random side character no. 1 kinda nerdy, clumsy etc.
Glenn with black hair and eyes? Wow, super hot, reliable ML. ( am I racist/colourist??? Lololol)
Verabus with brown hair- ew rando clingy and toxic piece of shit. Verabus with blond hair? Potential toxic ML in another manhwa, but is psychotic and hot. Like what's wrong with him? He couldve been beautiful vibe.
Most important-
Varabus got no chance with Ennid, because according to BL logic, same hair color never get together
tbh i think glunn looks very common with his black hair and black eyes maybe im being influenced by his outfits but i dont think so
i also think the same for his past look with red hair is still a bit average...i think its his character design