I think it was shown pretty clearly how that prissy wanna-be friend of ML is a morally unhinged loose cannon who pretends to be friends with ML for the sake of snitching to his big sis - who is also doing most of the shit he does (like giving Gunmu intel) for pure shits and giggles?
At the end of the day rich people are just people with more money, it's crazy that you ignore how much of an obvious bitch this guy is and assume that just because he's a chaebol this oddly specific blueprint applies to him. Like idk what to call this? Reverse classism? Crazy work brother.
Making an observation is hardly reverse classism. Believe it or not, it's a pretty strictly followed blueprint in korea. And this author keeps using pretty convenient and low hanging writing devices that read tacky.
I agree that that friend is shady, but I would hardly call him unhinged. He is just an opportunist, which is also pretty typical of the uber rich. However it is possible that he did that for shits and giggles. It still doesn't read that believable to me, as a lot of the writing in this manhwa doesn't, but you have a point.

There's no way the heir of a steel company, a chaebol would casually give information about one of his own ilk, the ML, to someone like the uke who is as broke as he can be, and definitely not just because the uke asked. That's not how the rich behave. Rich people share that kind of insider information with their own class, either that or when they have an ulterior motive, a more sinister objective. That so called friend of ML knows he has no chance of getting it with the uke, and anyway the rich keep their friends and casual fucks separate. They will never allow them to mingle at level playing field. This divide is much bigger in status obsessed korea than most other asian countries. Writer do better please. I am not even korean and even I get that.