I don’t know if you want spoilers but here if you really wanna know :
So the brother (sister in real world) is the one who wrote the second part of the novel where seonwoon gets abused and commits suicide because he hated his brother’s boyfriend (Sunbae (ML in real world) (who the fuck does that, even when I’m pissed at my brother I do not write about his death ) and he tried to interfere at every turn, he thinks he is entitled to choose for his brother until the very end and treats him like an idiot never tries to talk to him or tell him the truth about this world even while seeing him struggle and going crazy with incomprehension, lonelyness and anxiety from the situation and from the novel, all of that while enjoying the life he wrote for himself with a loving family and the girl (his friend) that he likes (I think) , in the end because of him MC falls into a pound and almost dies from drowning. He never goes back on his view and continue to undermine the ML who does everything for MC, he never apologies or talks with his brother, he couldn’t take care of his brother’s suffering but thinks that even though ML is doing everything in his life for MC he is not good, even though he does what he never did as a brother, every interaction he has with MC is him telling him that ML is shitty and that he should enjoy the life in the novel (even if not said like that), I mean he never tries to understand MC to ease his suffering or at least tell him the truth, he only think about himself, he really tries to control him (brother knew every thing from the beginning) that’s why I don’t like him, I feel bad for him too and I get where he comes from (abuse, love for his brother ,…)and I don’t hate him but still as a sister I can’t understand him even more so that I hate control (the idea that someone really tries to interfere in my life not just advise or I don’t know)

Fuck the brother (as a novel reader)