I reread chapter 4, 12 and 17. Both MC & ML was adopted into the company. I think the father raped ML and why he's still so traumatised and self harm with s**. That's probably why the ML thought MC was also adopted to sleep with the dad/"chairman" in ch 4. The light-haired brother probably found out and they made a plan for ML "to kill him" so he was sent into exile abroad, clues in ch 12. The dark haired brother probably doesn't know anything so that's why he hates ML while the other one says "they're all brothers" and defends ML in ch 17.
@Nextinline thank you! I'm gonna go have to reread those also. I thought the blond hair brother and his friends are the one who ráped him but your theory makes more sense. Definitely the dark haired brother doesn't know anything. I love hearing fellow readers thoughts and opinions (verses spoilers) it makes everything more exciting and interesting when we don't know what's going to happen and we have our other theories. (That's who I hate spoilers, they take all this away from us)
