I really like the seme in this manga he's not like other seme who would abused the MC physically and emotionally and would Force their self into them and we can understand in his POV that he didn't do any of his intrusive thoughts because he is aware that it is wrong That's a new one when reading ML POV I want to read more of ML POV's
I knew it I was right it's really obvious they're brothers
they already revealed/confirmed it in chapter 68 (the end)
https://www.mangago.zone/read-manga/minmotion_syndrome/uu/br_chapter-206832/pg-25/
Like you, I had a feeling they were brothers right when we met the evil guy's dad at the restaurant back in chapter 6: https://www.mangago.zone/read-manga/minmotion_syndrome/uu/to_chapter-6/pg-10/
I had a feeling that was the powerful Alpha, that they mentioned ML's omega dad was involved with, was the father







I can already see the future that guy and the MC will met again in the future then the MC will be shocked to see him and would try to avoid him then that guy would chase around the MC That's what always happen in every type of kind of this plot is there nothing new