Hyung is a common honorific. It may mean older brother, but it's a term of respect from one younger man to an older man.
You can see it a little like Sir.
It is his "real" brother in this world tho? They are blood related
You are commenting on a gloomy delusion. Where the main character was isekai'd into a fictional story.
I don't remember these characters every being related. The main character also mentions that he was supposed to meet the love interest later in the series so the timeline is a little thrown off.
They are talking about mc being rude to his little brother in school uniform
Ahhhhhhhh. My bad
lol you'll not like the little brother after the spoiler
Why does he treat his brother like this?
Even if he isn't his real brother, it is still waaay too bad.
The uke pmo sm, he is stupid