The story seems to flow that way. Knowing that they are not blood related but living together all this time as siblings, if that will be the outcome we are about to face some real drama and mental breakdown from so many characters. I am here to read the story, share my thoughts but not to judge any of others's !!!!!!!
╮(￣▽￣)╭
According to past comments
*SPOILER*
the brother is the ML I believe
Aaa i liked the blue haired too（￣へ￣）
they actually lived most of the time separate
I got some kind of disorder I can't stop shipping the two sibling