
So the old guy who was with the white haired guy is his (white haired dude) unrequited love/the person he loves. But that old guy is the white haired guy's father's lover/husband. The one who made marks on his body isn't the white haired guy but he's father. After the white haired guy's mother passed away he is the one who took care of him since young.
Did the pink hair guy has some kind of relationship with the MC's brother? I think the reason why he transferred school is related to the brother. I hope he doesn't like the MC just because he remind him of MC's brother.
Seriously my thoughts exactly but I think it's the opposite
He hated and acted cold towards him because he reminded him of his brother but then fell in love with him because he found that he's really cute. Though I'm sure that misunderstanding will probably happen dammit