Are you sure you got the first part correct?
Ummm not 100% sure but I saw some people talking about it and it made sense ngl
Spoiler alert for those who haven't read the existing chapters yet
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I mean the brother seems to have some unrequited feelings for the cop
And the kid he adopted resembles the cop in many ways
And he hates the idea of Yukio getting close to the kid or the Joseon culture because Yukio is everything he himself couldn't be
And his jealousy could be his motivation to murder his own brother (still a suspicion, but we already know... Duhhh)
So I think it makes a lot of sense that the whole thing is centred around those two and their history
i think scar dude is the endgame
I know the main story is about Yukio's brother and the cop, but my heart aches whenever I see these two
They're just innocent children, doing childish things :(