
I totally forgot about Kang Muhyeon who was the ML to the original novel MC was reincarnated into He’s not that important as Woo Jimin as of now though. As for Jimin’s relationship with the ML, MC was supposed to be bait to get Jimin’s attention. The ML acted as the toxic 2nd ML (Which sucks for poor Jimin cause both his ML and 2nd ML sucked ass apparently) who kidnaps Seungwon, forced him into a sexually abusive relationship which leads to Seungwon killing himself, upsetting Jimin because of how close they had gotten in the middle of Muhyeon’s unwanted advances.
There is also a major plot point stated by the MC where Seongjae experiences some traurig event and takes it out on Seongjae. (but I sadly don’t remember what chapter that was nor do I feel like finding it…)
In the end, Seo Sengwon was kidnapped by Tae Seongjae, fell in love with him, killed himself because of the abuse and unreciprocated feelings, and all the blame was put on Jimin because “Sengwon refused to listen to him”. This is especially cruel to Jimin in the original novel as Sengwon was the only real friend he had who he could rely on.
Ik all smut kind of made everything confusing but I’m here to help!
Chapter 1 shows how Seo Seungwon (MC) sees every one as a piece of paper, a fake relationship he was forced into when he was reincarnated into this life. His brown haired classmate, Woo Jimin, is the protagonist of the novel MC was reincarnated into and only met MC’s brother, Seo Seungjun, after Seo Seungwon killed himself. MC is worried them meeting earlier than they’re supposed to could have bad consequences even though he met Tae Seongjae (ML), earlier than he should’ve too.
As to why the MC reacted the way he did is because
1. He doesn’t consider Seungwon himself and by extension doesn’t consider Seungwon‘s family as his own and
2. Seungjun’s attitude towards the ML when he not only came unannounced but was extremely rude towards MC’s boyfriend (? Idk if they consider themselves dating, I forgot if they had that conversation)
Basically he’s tired of what is essentially a stranger, someone the MC doesn’t even acknowledge as real, barging into his life without his input and potentially damaging the integrity of the original novel and it’s storyline.