Why did they censor the mom's answer about the brother? Could they be not blood- related? Plot wise, I don't see any reason to censor if the answer is yes, they are brothers.
Maybe they're not, but the mom wants to keep it a secret for some reason. It is true that Dojun's hair color is different and can't possible be that dark when neither parent has black hair.
And I know you guys don't like the side story, but this just made me want to read Dohwa's story because it's really heartbreaking to see that he ends up alone. He can't choose who he loves.