Sometimes why is that bro still alive?

Like does anyone wonder how that oldest bro is still alive? Does he really have a brain? Fo u even know what u are doing? I hope you arent planning to make this yellow aerin do whatever u think the red aerin could do becz u just "believe" thats your true niece and throw her out becz then business would fail and then i hope he jinjja dies ._. once again everything written is just speculation i hope dude is actl not that dumb pls