Right, his brother is sick in the head but I saw some spoilers so I'm not as mad as I was before. Depending on how things will go on the story, I think I won't have a bad impression on the brother more than the one I previously have before I read the spoiler so I guess, for me, it's okay.
Could you spoil a bit? I'm really curious as to where this will lead to. (=・ω・=)
They said that this time around, it will gonna be a healing time or making-it-right time.
Sorry, I can't fully remember but it seems the three of them ML, MC and Brother will become better.
You can check out the spoilers below comments for more detailed info.
His brother's friend advised to fight and all. But seeing the way his brother behaves, I don't think,he will ever understand.
It's not something out of brotherly love. He doesn't love his Lil bro .he just wants to control him like a toy.