if this is your typical light novel isekai, this kid would be the snobby noble villain who keep boasting about his status and nobility plus talking down on the MC but get kicked the shit of em by the MC later on. But alas, he's supposed to be the 'Male MC' of this Romcom. When the main love interest is written this way, of course reader gonna prefer the other love interests (not naming anyone but, ahem.. Seo Kouji).

Ahhh, he's too bratty for my taste... I do like older woman x younger man romances....but he's too rude, impolite and annoying D: Why do we have this kind of male lead? I wouldn't mind him not being the male lead; he should just be the obstacle to a wonderful marriage between the heroine and the older brother; then I'd probably hate him less X'DDD

There is a line even in family members why the heck he is crossing the line. Spoiled brat . 😖

Why make us hate this dude so much if he's gonna end up with her anyway?
He just sounds and acts like a prick, also he has no right to refuse whoever his brother wants to marry... like who gave him that right? He says she looks like a child but he's the one that acts like a 5 year old. Fking spoiled brat who wants to monopolize his brother 😑😑

AH my brain cells are dying at a faster rate than normal now because of the stupid younger brother

"what happened to her feet"
This guy.
Seriously.