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Martial arts plots are always confusing lol.
So, from what I got, the boy is Cho Yun’s older brother (the guy MC transmigrated into). Apparently, Cho Yun killed his bro, and now the Namgoong clan brought him back in a kid’s body (they couldn't use a mature body who knew martial arts).
Why would they even do that? I have no idea.
Anyway, the brother’s out for revenge.
And remember the prologue? The ML was talking like the MC had died, so honestly… it’s totally possible the brother might actually pull it off.
We all know kids are our MC’s ultimate weakness

Help I'm so stupid, somebody explains it to me like I'm a goldfish