He’s not mad because he is an omega and Su-ah turned out to be the alpha — he’s mad because the very selfish, self-centered, and deliberate actions of someone will forever dictate his life.
Su-ah kept showering the MC with his pheromones as they grew up, making him dependent on them.
Su-ah is the very reason the MC cannot control his own pheromones and, therefore, has no freedom over his body or even the freedom to walk outside alone.
Su-ah is the very reason the MC is being objectified and used right now.
I have a much more argumentative set of comments you can check out.
Wasn’t the only reason he showered him with pheromones because MC couldn’t handle the fact that he was an omega, therefore neglecting his omega needs? I interpret ML’s showering as a protection so that he didn’t have to face it head-on.
He was surprised when he smelt the alphas.. like it’s never happened before.
Plus, he HAD access to information. Everyone was supportive. He was just a brat (lowkey).
Him, in turn, being reliant on ML was an unfortunately side effect of being protected from his own secondary gender.
LMK if this makes any sense/if I’m completely wrong

Idk guys I feel bad asf. I know the mc is mad but it’s really not fair bc they were in such proximity when they were younger and it’s not like Su-ah did it on purpose. Literally started hating himself bc he was an alpha bc he knew how the mc would react. They’re both suffering in the present- this sucks Su-ah was always going to be an alpha, no matter what, yeah he may have affected the mcs chances but with a childhood as affectionate and close as theirs it was bound to happen